mb/lenovo/x131e: add VBT

VBT was extracted from VBIOS ROM.
Tested with libgfxinit, booting SeaBIOS into Linux.

Change-Id: Ibedb43852dc9b846850e1070b84f708c847b7dbf
Signed-off-by: James Ye <jye836@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31003
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lenovo/x131e/Kconfig

@@ -21,6 +21,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_LIBGFXINIT
 	select GFX_GMA_INTERNAL_IS_LVDS
 	select SERIRQ_CONTINUOUS_MODE
+	select INTEL_GMA_HAVE_VBT
 
 config MAINBOARD_DIR
 	string