mb/google/octopus: Add VBT for ampton variant

Add VBT file, extracted from stock Google firmware, and
select its use via Kconfig.

Change-Id: I256c1c72d1d1e40ea9426fa717bfc4f9c950a91f
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40595
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/octopus/Kconfig

@@ -17,6 +17,7 @@ config BOARD_GOOGLE_BASEBOARD_OCTOPUS
 	select EC_GOOGLE_CHROMEEC_ESPI
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
+	select INTEL_GMA_HAVE_VBT if BOARD_GOOGLE_AMPTON
 	select INTEL_LPSS_UART_FOR_CONSOLE
 	select MAINBOARD_HAS_CHROMEOS
 	select SOC_ESPI