mb/google/brya/var/redrix: Add privacy screen

Add privacy screen support.

BUG=b:198188272
TEST=build and check SSDT

Signed-off-by: Wisley Chen <wisley.chen@quanta.corp-partner.google.com>
Change-Id: Ied9d9138f68ba45c4d746aed1cd3f828d4ab7fae
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57289
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/mainboard/google/brya/Kconfig.name

@@ -34,6 +34,7 @@ config BOARD_GOOGLE_REDRIX
 	select DRIVERS_INTEL_MIPI_CAMERA
 	select SOC_INTEL_COMMON_BLOCK_IPU
 	select DRIVERS_GENESYSLOGIC_GL9755
+	select DRIVERS_GFX_GENERIC
 
 config BOARD_GOOGLE_KANO
 	bool "-> Kano"