drm/display: Add missing Panel Replay Enable SU Region ET bit

Add missing Panel Replay Enable SU Region ET bit defined in DP2.1
specification.
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240607134917.1327574-6-jouni.hogander@intel.com

include/drm/display/drm_dp.h

@@ -743,6 +743,7 @@
 # define DP_PANEL_REPLAY_RFB_STORAGE_ERROR_EN           (1 << 4)
 # define DP_PANEL_REPLAY_ACTIVE_FRAME_CRC_ERROR_EN      (1 << 5)
 # define DP_PANEL_REPLAY_SU_ENABLE                      (1 << 6)
+# define DP_PANEL_REPLAY_ENABLE_SU_REGION_ET            (1 << 7) /* DP 2.1 */
 
 #define PANEL_REPLAY_CONFIG2                                     0x1b1 /* eDP 1.5 */
 # define DP_PANEL_REPLAY_SINK_REFRESH_RATE_UNLOCK_GRANTED	 (1 << 0)