serial: oc: Implement CONFIG_SERIAL_MULTI into OpenCores serial driver

Implement support for CONFIG_SERIAL_MULTI into OpenCores serial driver.
This driver was so far only usable directly, but this patch also adds
support for the multi method. This allows using more than one serial
driver alongside the OpenCores driver. Also, add a weak implementation
of default_serial_console() returning this driver.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
Cc: Scott McNutt <smcnutt@psyent.com>
diff --git a/common/serial.c b/common/serial.c
index a2a55aa..89f58c4 100644
--- a/common/serial.c
+++ b/common/serial.c
@@ -76,6 +76,7 @@
 serial_initfunc(lpc32xx_serial_initialize);
 serial_initfunc(mcf_serial_initialize);
 serial_initfunc(ns9750_serial_initialize);
+serial_initfunc(oc_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -130,6 +131,7 @@
 	lpc32xx_serial_initialize();
 	mcf_serial_initialize();
 	ns9750_serial_initialize();
+	oc_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }