amd/sb600: Enable COM2 at all times in early setup

Otherwise with a coreboot log on COM2 (which doesn't work) the boot
process takes eons.

Change-Id: I886f98b715c1f384c8693f2977671ff15897b5a5
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/241
Reviewed-by: Marc Jones <marcj303@gmail.com>
Tested-by: build bot (Jenkins)
1 file changed