sio/nuvoton: Include generic nuvoton driver in bootblock stage

The purpose of this change is to enable serial output in
bootblock stage

Change-Id: I8e075f1e70d1a6598dfdc34931218f5af9637178
Signed-off-by: Teo Boon Tiong <boon.tiong.teo@intel.com>
Reviewed-on: https://review.coreboot.org/17359
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed