gma ACPI: Make brightness levels a per board setting

Those are actually board specific. Keep the old value as defaults,
though. The defaults are included by all affected boards.

Change-Id: Ib865c7b4274f2ea3181a89fc52701b740f9bab7d
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/11705
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
diff --git a/src/mainboard/packardbell/ms2290/dsdt.asl b/src/mainboard/packardbell/ms2290/dsdt.asl
index c2d96f3..b36f909 100644
--- a/src/mainboard/packardbell/ms2290/dsdt.asl
+++ b/src/mainboard/packardbell/ms2290/dsdt.asl
@@ -44,6 +44,8 @@
 			#include <northbridge/intel/nehalem/acpi/nehalem.asl>
 			#include <southbridge/intel/bd82x6x/acpi/pch.asl>
 			#include <southbridge/intel/bd82x6x/acpi/default_irq_route.asl>
+
+			#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
 		}
 		Device (UNCR)
 		{