backend/drm: rotation is a plane property

"rotation" is a plane property, it's not a CRTC property. It was also
missing from plane_info.

backend/drm/properties.c

@@ -35,7 +35,6 @@ static const struct prop_info crtc_info[] = {
 	{ "GAMMA_LUT_SIZE", INDEX(gamma_lut_size) },
 	{ "MODE_ID", INDEX(mode_id) },
 	{ "VRR_ENABLED", INDEX(vrr_enabled) },
-	{ "rotation", INDEX(rotation) },
 	{ "scaling mode", INDEX(scaling_mode) },
 #undef INDEX
 };
@@ -53,6 +52,7 @@ static const struct prop_info plane_info[] = {
 	{ "SRC_W", INDEX(src_w) },
 	{ "SRC_X", INDEX(src_x) },
 	{ "SRC_Y", INDEX(src_y) },
+	{ "rotation", INDEX(rotation) },
 	{ "type", INDEX(type) },
 #undef INDEX
 };

include/backend/drm/properties.h

@@ -28,7 +28,6 @@ union wlr_drm_connector_props {
 union wlr_drm_crtc_props {
 	struct {
 		// Neither of these are guaranteed to exist
-		uint32_t rotation;
 		uint32_t scaling_mode;
 		uint32_t vrr_enabled;
 		uint32_t gamma_lut;