This patch allows override to the `SkipExtGfxScan` UPD.
Ideally a platform with an on-board graphics device should skip
scanning external GFX devices aka set this UPD to `1`.
BUG=b:228002764
TEST=Able to build and boot google/rex.
Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I00e15b71ed67119df9ca6f98a750ede109ff33fe
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72947
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Dinesh Gehlot <digehlot@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
f57eb1a640