mb/google/puff: Add VBT for Ambassador variant

Add data.vbt file and Kconfig to use it.

Extracted from google firmware ambassador_13324.283.0

TEST=build ambassador with FSP GOP display init.

Change-Id: I5c47700c5abe7d96112702d48a2b749f1784a494
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78032
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/mainboard/google/puff/Kconfig

@@ -38,6 +38,7 @@ config BOARD_GOOGLE_BASEBOARD_PUFF
 
 config BOARD_GOOGLE_AMBASSADOR
 	select BOARD_GOOGLE_BASEBOARD_PUFF
+	select INTEL_GMA_HAVE_VBT
 
 config BOARD_GOOGLE_DOOLY
 	select BOARD_GOOGLE_BASEBOARD_PUFF