serial: mips: Implement CONFIG_SERIAL_MULTI into au1x00 serial driver

serial: mips: Implement CONFIG_SERIAL_MULTI into au1x00 serial driver

Implement support for CONFIG_SERIAL_MULTI into au1x00 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 au1x00 driver. Also, add a weak implementation
of default_serial_console() returning this driver.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Daniel Schwierzeck <[email protected]>