powerpc/shared/console: Make console baud rate configurable.

The "powerpc/shared/console" code has the start-up console value fixed
at 9600 baud.  This changes the hard-wired constant "9600" in the code
to the configuration setting "BSP_CONSOLE_BAUD" and adds configuration
support in both the "waf" and the legacy configuration systems.

Note that the VME BSPs beatnik, mvme3100, and mve5100 can be improved
by adding a "mvmexxxx" BSP family. This configuration change, as well
as future configuration changes, could then be made in a "grp.yml" file.

bsps/powerpc/shared/console/console.c

@@ -153,8 +153,8 @@ static int console_first_open(int major, int minor, void *arg)
   /* must not open a minor device we have no ISR for */
   assert( minor>=0 && minor < sizeof(ttyS)/sizeof(ttyS[0]) && ttyS[minor].isr );
 
-  /* 9600-8-N-1 */
-  BSP_uart_init(minor, 9600, 0);
+  /* BSP_CONSOLE_BAUD-8-N-1 */
+  BSP_uart_init(minor, BSP_CONSOLE_BAUD, 0);
   status = BSP_uart_install_isr(minor, ttyS[minor].isr);
   if (!status) {
     printk("Error installing serial console interrupt handler for '%s'!\n",

bsps/powerpc/shared/console/uart.c

@@ -160,7 +160,7 @@ BSP_uart_init(int uart, int baud, int hwFlow)
 
   if ( (int)BSPBaseBaud <= 0 ) {
   	/* Use current divisor assuming BSPBaseBaud gives us the current speed */
-	BSPBaseBaud  = BSPBaseBaud ? -BSPBaseBaud : 9600;
+	BSPBaseBaud  = BSPBaseBaud ? -BSPBaseBaud : BSP_CONSOLE_BAUD;
 	BSPBaseBaud *= ((uread(uart, DLM) << 8) | uread(uart, DLL));
   }