serial: powerpc: Implement CONFIG_SERIAL_MULTI into ml2 serial driver

Implement support for CONFIG_SERIAL_MULTI into ml2 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 ml2 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: Anatolij Gustschin <agust@denx.de>
Cc: Stefan Roese <sr@denx.de>
diff --git a/common/serial.c b/common/serial.c
index c01b7a5..5673ccd 100644
--- a/common/serial.c
+++ b/common/serial.c
@@ -67,6 +67,7 @@
 serial_initfunc(cogent_serial_initialize);
 serial_initfunc(cpci750_serial_initialize);
 serial_initfunc(evb64260_serial_initialize);
+serial_initfunc(ml2_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -112,6 +113,7 @@
 	cogent_serial_initialize();
 	cpci750_serial_initialize();
 	evb64260_serial_initialize();
+	ml2_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }