drm: Use DRM_ROTATE_MASK and DRM_REFLECT_MASK

Avoid magic numbers and use the introduced defines.

Cc: Ville Syrjälä <[e-mail]>
Signed-off-by: Joonas Lahtinen <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c

···
 		if (!state->bpp[i])
 			return -EINVAL;
 
-		switch (state->base.rotation & 0xf) {
+		switch (state->base.rotation & DRM_ROTATE_MASK) {
 		case BIT(DRM_ROTATE_90):
 			offset = ((y_offset + state->src_y + patched_src_w - 1) /
 				  ydiv) * fb->pitches[i];

drivers/gpu/drm/drm_crtc.c

···
 {
 	if (rotation & ~supported_rotations) {
 		rotation ^= BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y);
-		rotation = (rotation & ~0xf) | BIT((ffs(rotation & 0xf) + 1) % 4);
+		rotation = (rotation & DRM_REFLECT_MASK) |
+		           BIT((ffs(rotation & DRM_ROTATE_MASK) + 1) % 4);
 	}
 
 	return rotation;

drivers/gpu/drm/drm_rect.c

···
 		}
 	}
 
-	switch (rotation & 0xf) {
+	switch (rotation & DRM_ROTATE_MASK) {
 	case BIT(DRM_ROTATE_0):
 		break;
 	case BIT(DRM_ROTATE_90):
···
 {
 	struct drm_rect tmp;
 
-	switch (rotation & 0xf) {
+	switch (rotation & DRM_ROTATE_MASK) {
 	case BIT(DRM_ROTATE_0):
 		break;
 	case BIT(DRM_ROTATE_90):

drivers/gpu/drm/omapdrm/omap_fb.c

···
 		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);
···
 		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 */

drivers/gpu/drm/omapdrm/omap_plane.c

···
 	win.src_x = state->src_x >> 16;
 	win.src_y = state->src_y >> 16;
 
-	switch (state->rotation & 0xf) {
+	switch (state->rotation & DRM_ROTATE_MASK) {
 	case BIT(DRM_ROTATE_90):
 	case BIT(DRM_ROTATE_270):
 		win.src_w = state->src_h >> 16;