serial: arm: Implement CONFIG_SERIAL_MULTI into s3c44b0 serial driver

Implement support for CONFIG_SERIAL_MULTI into s3c44b0 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 s3c44b0 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>
diff --git a/common/serial.c b/common/serial.c
index 96e69d5..d60e6d2 100644
--- a/common/serial.c
+++ b/common/serial.c
@@ -90,6 +90,7 @@
 serial_initfunc(mxc_serial_initialize);
 serial_initfunc(netarm_serial_initialize);
 serial_initfunc(pl01x_serial_initialize);
+serial_initfunc(s3c44b0_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -158,6 +159,7 @@
 	mxc_serial_initialize();
 	netarm_serial_initialize();
 	pl01x_serial_initialize();
+	s3c44b0_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }