soc/intel/baytrail: set default VBIOS filename and PCI ID

All Baytrail boards have the same GPU PCI ID, so set it
here to avoid having to set it in each board's config.

Move the VGA_BIOS_FILE config from google/rambi into soc/baytrail
since it likewise applies to all Baytrail boards.

Change-Id: Id1e0580b55e3590d868cb839987f06c49bb07cf5
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33026
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/rambi/Kconfig

@@ -90,10 +90,6 @@ config EC_GOOGLE_CHROMEEC_BOARDNAME
 	string
 	default ""
 
-config VGA_BIOS_FILE
-	string
-	default "pci8086,0f31.rom"
-
 config MAINBOARD_SMBIOS_MANUFACTURER
 	string
 	default "GOOGLE"

src/soc/intel/baytrail/Kconfig

@@ -168,4 +168,14 @@ config REFCODE_BLOB_FILE
 
 endif # HAVE_REFCODE_BLOB
 
+config VGA_BIOS_ID
+	string
+	depends on VGA_BIOS
+	default "8086,0f31"
+
+config VGA_BIOS_FILE
+	string
+	depends on VGA_BIOS
+	default "pci8086,0f31.rom"
+
 endif