drm: Use DRM_ROTATE_MASK and DRM_REFLECT_MASK

Avoid magic numbers and use the introduced defines.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/omapdrm/omap_fb.c b/drivers/gpu/drm/omapdrm/omap_fb.c
index 51b1219..636a1f9 100644
--- a/drivers/gpu/drm/omapdrm/omap_fb.c
+++ b/drivers/gpu/drm/omapdrm/omap_fb.c
@@ -171,7 +171,7 @@
 		uint32_t w = win->src_w;
 		uint32_t h = win->src_h;
 
-		switch (win->rotation & 0xf) {
+		switch (win->rotation & DRM_ROTATE_MASK) {
 		default:
 			dev_err(fb->dev->dev, "invalid rotation: %02x",
 					(uint32_t)win->rotation);
@@ -209,7 +209,7 @@
 		info->rotation_type = OMAP_DSS_ROT_TILER;
 		info->screen_width  = omap_gem_tiled_stride(plane->bo, orient);
 	} else {
-		switch (win->rotation & 0xf) {
+		switch (win->rotation & DRM_ROTATE_MASK) {
 		case 0:
 		case BIT(DRM_ROTATE_0):
 			/* OK */