mb/google/rex: Set `SkipExtGfxScan` FSP-M UPD

This patch overrides `SkipExtGfxScan` UPD as the Rex device is
equipped with an on-board graphics device hence, skip scanning
external GFX devices.

BUG=b:228002764
TEST=Able to save ~1ms+ boot time on google/rex.

FSP FPDT Data is showing the timestamp between those function calls.

Without this patch:
[INFO ] CheckOffboardPcieVga/5b7cc220-e183-481c-87f427a92d8db88f -> 979684 -> 22
[INFO ] CheckOffboardPcieVga/5b7cc220-e183-481c-87f427a92d8db88f -> 980815 -> 1131

With this patch:

`CheckOffboardPcieVga` is not getting called.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I20aa09e80671ab94e639787f40b95b740bbe5efb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72948
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>

0 files changed, 0 insertions, 0 deletions