FSP code will default enable the onboard serial port.
When external serial port is used, this onboard port needs to be
disabled.
Add function mainboard_after_memory_init() function to perform
required actions to re-enabled output to external serial port.
BUG=N/A
TEST=LPC Post card on Intel Cherry Hill
Change-Id: Ibb6c9e4153b3de58791b211c7f4241be3bceae9d
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/28464
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
1385b7dd10