drm/gma500: Add Minnowboard to the IS_MRST() macro

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
diff --git a/drivers/gpu/drm/gma500/psb_drv.h b/drivers/gpu/drm/gma500/psb_drv.h
index 0bab46b..b26d029 100644
--- a/drivers/gpu/drm/gma500/psb_drv.h
+++ b/drivers/gpu/drm/gma500/psb_drv.h
@@ -45,7 +45,7 @@
 };
 
 #define IS_PSB(dev) (((dev)->pdev->device & 0xfffe) == 0x8108)
-#define IS_MRST(dev) (((dev)->pdev->device & 0xfffc) == 0x4100)
+#define IS_MRST(dev) (((dev)->pdev->device & 0xfff0) == 0x4100)
 #define IS_MFLD(dev) (((dev)->pdev->device & 0xfff8) == 0x0130)
 #define IS_CDV(dev) (((dev)->pdev->device & 0xfff0) == 0x0be0)