mb/google/reef: Add VBTs for all variants

Adjust Kconfig so all variants use proper VBTs.
Add Makefile entries for variants which use multiple VBTs.

extracted from ChromeOS firmwares:
Google_Coral.10068.113.0
Google_Pyro.9042.233.0
Google_Reef.9042.233.0
Google_Sand.9042.220.0
Google_Snappy.9042.253.0

Change-Id: I46ad4ec321e32d019e44f0741956b18a464fb8ae
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61685
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/google/reef/Kconfig

@@ -106,8 +106,4 @@ config PRERAM_CBMEM_CONSOLE_SIZE
 config FMDFILE
 	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/default.fmd" if !CHROMEOS
 
-# Override the default behavior, since the data.vbt is the same for all variants
-config INTEL_GMA_VBT_FILE
-	default "src/mainboard/\$(MAINBOARDDIR)/data.vbt"
-
 endif # BOARD_GOOGLE_REEF

src/mainboard/google/reef/variants/coral/Makefile.inc

@@ -4,3 +4,11 @@ ramstage-y += mainboard.c
 ramstage-y += gpio.c
 
 smm-y += gpio.c
+
+$(call add_vbt_to_cbfs, vbt-astronaut.bin, astronaut-data.vbt)
+$(call add_vbt_to_cbfs, vbt-babytiger.bin, babytiger-data.vbt)
+$(call add_vbt_to_cbfs, vbt-babymega.bin, babymega-data.vbt)
+$(call add_vbt_to_cbfs, vbt-epaulette.bin, epaulette-data.vbt)
+$(call add_vbt_to_cbfs, vbt-nasher.bin, nasher-data.vbt)
+$(call add_vbt_to_cbfs, vbt-rabbid_rugged.bin, rabbid_rugged-data.vbt)
+$(call add_vbt_to_cbfs, vbt-santa.bin, santa-data.vbt)