[PATCH] Altix: rs422 support for ioc4 serial driver

Add rs422 support to the Altix ioc4 serial driver.
Signed-off-by: NPatrick Gefre <pfg@sgi.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>