drm/amd/display: Expose send immediate sdp message interface

[Why]
To send sdp message immediately from a single slot.

[How]
Modify the generic SDP message interface, and use GSP4 to send immediate
sdp message.
Signed-off-by: Leo (Hanghong) Ma <hanghong.ma@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc_stream.h

@@ -126,7 +126,6 @@ struct dc_stream_state {
 	struct dc_info_packet vrr_infopacket;
 	struct dc_info_packet vsc_infopacket;
 	struct dc_info_packet vsp_infopacket;
-	struct dc_info_packet dpsdp_infopacket;
 
 	struct rect src; /* composition area */
 	struct rect dst; /* stream addressable area */