mb/lenovo/z61t: Add VBT-file

This file was extracted directly from the vendor's firmware ver. 2.27.

Change-Id: Ic2d2b259f3b535a791c9dcfdf962c03a0bab87a2
Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Reviewed-on: https://review.coreboot.org/29148
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/mainboard/lenovo/z61t/Kconfig

@@ -23,6 +23,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select H8_DOCK_EARLY_INIT
 	select HAVE_CMOS_DEFAULT
+	select INTEL_GMA_HAVE_VBT
 
 config MAINBOARD_DIR
 	string