payloads/SeaBIOS: Add different MMIO uart configurations

The MMIO address can change for different platforms
like Apollolake.

Change-Id: I6ec72d3a14f00212323a04e20d5a477dbc26b770
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/22631
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
2 files changed