siemens/mc_apl1: Enable decoding for COM 3 on LPC

Since this mainboard provides 3 COM ports on LPC, enable decoding of the
corresponding address range for COM 3.

Change-Id: I15c0748fce67eef46401c314f441aa45f5e3c5fa
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/20162
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
1 file changed