syslog: Remove SYSLOG_SERIAL_CONSOLE which isn't really used

Documentation/NuttxPortingGuide.html

@@ -6716,7 +6716,7 @@ int syslog_initialize(void);
 <ol>
   <li>
     <p><b>Low-Level Serial Output</b>.
-      If you are using a SYSLOG console channel (<code>CONFIG_SYSLOG_CONSOLE</code>) with a serial console (<code>CONFIG_SYSLOG_SERIAL_CONSOLE</code>) and if the underlying architecture supports the low-level <code>up_putc()</code> interface(<code>CONFIG_ARCH_LOWPUTC</code>), then the SYLOG logic will direct the output to <code>up_putc()</code> which is capable of generating the serial output within the context of an interrupt handler.
+      If you are using a SYSLOG console channel (<code>CONFIG_SYSLOG_CONSOLE</code>) and if the underlying architecture supports the low-level <code>up_putc()</code> interface(<code>CONFIG_ARCH_LOWPUTC</code>), then the SYLOG logic will direct the output to <code>up_putc()</code> which is capable of generating the serial output within the context of an interrupt handler.
     </p>
     <p>
       There are a few issues in doing this however:
@@ -6781,16 +6781,12 @@ int syslog_initialize(void);
   </li>
   <li>
     <p>
-      <code>CONFIG_SYSLOG_CONSOLE</code>.  This configuration option is manually selected from the SYSLOG menu.  This is the option that actually enables the SYSLOG console device.  It depends on <code>CONFIG_DEV_CONSOLE</code> and it will automatically select <code>CONFIG_SYSLOG_SERIAL_CONSOLE</code> if <code>CONFIG_SERIAL_CONSOLE</code> is selected.
+      <code>CONFIG_SYSLOG_CONSOLE</code>.  This configuration option is manually selected from the SYSLOG menu.  This is the option that actually enables the SYSLOG console device.  It depends on <code>CONFIG_DEV_CONSOLE</code>.
   </li>
   <li>
     <p>
       <code>CONFIG_ARCH_LOWPUTC</code>.  This is an indication from the architecture configuration that the platform supports the <code>up_putc()</code> interface.  <code>up_putc()</code> is a very low level UART interface that can even be used from interrupt handling.
   </li>
-  <li>
-    <p>
-      <code>CONFIG_SYSLOG_SERIAL_CONSOLE</code>.  This enables certain features of the SYSLOG operation that depend on a serial console.  If <code>CONFIG_ARCH_LOWPUTC</code> is also selected, for example, then <code>up_putc()</code> will be used for the forced SYSLOG output.
-  </li>
 </ul>
 <p>
   Interrupt level SYSLOG output will be lost unless:  (1) the interrupt buffer

boards/arm/samv7/samv71-xult/README.txt

@@ -1902,7 +1902,6 @@ Configuration sub-directories
        following in the .config file:
 
          CONFIG_SYSLOG_CONSOLE=y
-         CONFIG_SYSLOG_SERIAL_CONSOLE=y
 
     7. Telnet:  The clicker2-stm32 star point configuration supports the
        Telnet daemon, but not the Telnet client; the star hub configuration

drivers/syslog/Kconfig

@@ -126,10 +126,6 @@ config SYSLOG_PREFIX_STRING
 	---help---
 		The prefix string to be prepend.
 
-config SYSLOG_SERIAL_CONSOLE
-	bool
-	default n
-
 choice
 	prompt "System log device"
 	default SYSLOG_CONSOLE if DEV_CONSOLE
@@ -156,7 +152,6 @@ config RAMLOG_SYSLOG
 config SYSLOG_CONSOLE
 	bool "Log to /dev/console"
 	depends on DEV_CONSOLE
-	select SYSLOG_SERIAL_CONSOLE if SERIAL_CONSOLE
 	select SYSLOG_WRITE
 	---help---
 		Use the system console as a SYSLOG output device.

drivers/syslog/README.txt

@@ -235,9 +235,8 @@ SYSLOG Channels
 
   1. Low-Level Serial Output
   --------------------------
-  If you are using a SYSLOG console channel (CONFIG_SYSLOG_CONSOLE) with a
+  If you are using a SYSLOG console channel (CONFIG_SYSLOG_CONSOLE) and if
-  serial console (CONFIG_SYSLOG_SERIAL_CONSOLE) and if the underlying
+  the underlying architecture supports the low-level up_putc() interface
-  architecture supports the low-level up_putc() interface
   (CONFIG_ARCH_LOWPUTC), then the SYSLOG logic will direct the output to
   up_putc() which is capable of generating the serial output within the
   context of an interrupt handler.
@@ -301,17 +300,11 @@ SYSLOG Channel Options
       There is no user selection.
     * CONFIG_SYSLOG_CONSOLE.  This configuration option is manually selected
       from the SYSLOG menu.  This is the option that acutally enables the
-      SYSLOG console device.  It depends on CONFIG_DEV_CONSOLE and it will
+      SYSLOG console device.  It depends on CONFIG_DEV_CONSOLE.
-      automatically select CONFIG_SYSLOG_SERIAL_CONSOLE if
-      CONFIG_SERIAL_CONSOLE is selected.
     * CONFIG_ARCH_LOWPUTC.  This is an indication from the architecture
       configuration that the platform supports the up_putc() interface.
       up_putc() is a very low level UART interface that can even be used from
       interrupt handling.
-    * CONFIG_SYSLOG_SERIAL_CONSOLE.  This enables certain features of the
-      SYSLOG operation that depend on a serial console.  If
-      CONFIG_ARCH_LOWPUTC is also selected, for example, then up_putc() will
-      be used for the forced SYSLOG output.
 
   Interrupt level SYSLOG output will be lost unless:  (1) the interrupt buffer
   is enabled to support serialization, or (2) a serial console is used and