mb/google/glados: restore device-specific VBTs

When migrating glados (and variants) to FSP 2.0, the older board-
specific VBTs were dropped in favor of the default FSP 2.0 VBT due to
compatibility issues. Now that libgfxinit is available and the default,
restore the board-specific VBTs so that external displays function
properly. Select MAINBOARD_NO_FSP_GOP for all variants except glados
since FSP/GOP init will not function properly with the older VBTs.

Test: build/boot chell and caroline variants w/libgfxinit, verify
external displays now work again.

Change-Id: If55a67e0d3d78e4acf80cee1733ad8e14b8847d4
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37397
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/glados/Kconfig

@@ -20,6 +20,7 @@ config BOARD_GOOGLE_BASEBOARD_GLADOS
 	select SOC_INTEL_SKYLAKE
 	select SYSTEM_TYPE_LAPTOP
 	select MAINBOARD_HAS_LIBGFXINIT
+	select MAINBOARD_NO_FSP_GOP if !BOARD_GOOGLE_GLADOS
 
 if BOARD_GOOGLE_BASEBOARD_GLADOS
 
@@ -63,9 +64,6 @@ config DEVICETREE
 	string
 	default "variants/$(CONFIG_VARIANT_DIR)/devicetree.cb"
 
-config INTEL_GMA_VBT_FILE
-	default "3rdparty/fsp/KabylakeFspBinPkg/SampleCode/Vbt/Vbt.bin"
-
 config MAX_CPUS
 	int
 	default 8
@@ -94,4 +92,5 @@ config EC_GOOGLE_CHROMEEC_PD_BOARDNAME
 config UART_FOR_CONSOLE
 	int
 	default 2
+
 endif