lenovo/x200: Fix black screen on quick boot.

Otherwise without USB when coreboot boots too quickly
EC is confused and thinks that LID is closed and so
powers off the backlight until user flaps the lid.

Change-Id: I14dfaa62582de83fd4c9f9518e9436b3a3035366
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6651
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)

src/mainboard/lenovo/x200/devicetree.cb

@@ -156,7 +156,7 @@ chip northbridge/intel/gm45
 					end
 
 					register "config0" = "0xa6"
-					register "config1" = "0x05"
+					register "config1" = "0x04"
 					register "config2" = "0xa0"
 					register "config3" = "0x01"