bsps: Move libchip to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/shared/dev/serial/README.ns16550

@@ -0,0 +1,82 @@
+Status
+======
+
+There are no known problems with this driver.
+
+Configuration Table Use
+=======================
+
+sDeviceName
+
+   The name of this device.
+
+deviceType
+
+   This field must be SERIAL_NS16550.
+
+pDeviceFns
+
+   The device interface control table.  This may be:
+      + ns16550_fns for interrupt driven IO
+      + ns16550_fns_polled for polled IO
+
+deviceProbe
+
+   This is the address of the routine which probes to see if the device
+   is present.
+
+pDeviceFlow
+
+   This field is ignored as hardware flow control is not currently supported.
+
+ulMargin
+
+    This is currently unused.
+
+ulHysteresis
+
+    This is currently unused.
+
+pDeviceParams
+
+    This is set to the default settings.  At this point, it is the default
+    baud rate cast as a (void *).
+
+ulCtrlPort1
+
+   This field is the base address of this port on the UART.
+
+ulCtrlPort2
+
+   This field is unused for the NS16550.
+
+ulDataPort
+
+   This field is the base address of this port on the UART. 
+
+getRegister
+setRegister
+
+   These follow standard conventions.
+
+getData
+setData
+
+   These are unused since the TX and RX data registers can be accessed
+   as regular registers.
+
+ulClock
+
+   This is the clock constant which is divided by the desired baud
+   to get the value programmed into the part.  The formula for this
+   for 9600 baud is:
+
+      chip_divisor_value = ulClock / 9600.
+
+   NOTE: When ulClock is 0, the correct value for a PC (115,200) is
+   used.
+
+ulIntVector
+
+   This is the interrupt vector number associated with this chip.
+