mb/asus/p8z77-m: Properly configure early serial

Board was not producing serial output until well into ramstage.

To fix, select SUPERIO_NUVOTON_COMMON_COM_A Kconfig to tell
nuvoton_enable_serial() to route serial port A signals to the outside,
not GPIO8x.

TEST=Full native raminit debug log received over serial by minicom.

Change-Id: I376a79dd76ffa5f4d47e7c0cb53680e173e1ad78
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79222
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions