drm: Add eDP 1.5 early transport definition

Add DP_PSR_ENABLE_SU_REGION_ET to enable panel early transport.

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231218175004.52875-2-jouni.hogander@intel.com

include/drm/display/drm_dp.h

@@ -715,6 +715,7 @@
 # define DP_PSR_SU_REGION_SCANLINE_CAPTURE	BIT(4) /* eDP 1.4a */
 # define DP_PSR_IRQ_HPD_WITH_CRC_ERRORS		BIT(5) /* eDP 1.4a */
 # define DP_PSR_ENABLE_PSR2			BIT(6) /* eDP 1.4a */
+# define DP_PSR_ENABLE_SU_REGION_ET             BIT(7) /* eDP 1.5 */
 
 #define DP_ADAPTER_CTRL			    0x1a0
 # define DP_ADAPTER_CTRL_FORCE_LOAD_SENSE   (1 << 0)