mb/hp/snb_ivb_laptops: Add VBT for Elitebook 8460p

Extracted from a system running OEM BIOS version F.42.
intelvbttool --inlegacy --outvbt data.vbt

Change-Id: I6e499eb7ff8edb6556f8211d2fb8246cba5f5276
Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79625
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/hp/snb_ivb_laptops/Kconfig

@@ -54,6 +54,7 @@ config BOARD_HP_8460P
 	select BOARD_HP_SNB_IVB_LAPTOPS_COMMON
 	select BOARD_ROMSIZE_KB_8192
 	select GFX_GMA_PANEL_1_ON_LVDS
+	select INTEL_GMA_HAVE_VBT
 	select INTEL_INT15
 	select MAINBOARD_HAS_LIBGFXINIT
 	select SOUTHBRIDGE_INTEL_BD82X6X