drm/amd/display: Define PSR ERROR Status bit VSC_SDP

[why]
So we can track VSC SDP errors from display

[how]
Define the bit, and use it in driver logic
Signed-off-by: NReza Amini <Reza.Amini@amd.com>
Acked-by: NAurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h

@@ -90,7 +90,8 @@ union psr_error_status {
 	struct {
 		unsigned char LINK_CRC_ERROR        :1;
 		unsigned char RFB_STORAGE_ERROR     :1;
-		unsigned char RESERVED              :6;
+		unsigned char VSC_SDP_ERROR         :1;
+		unsigned char RESERVED              :5;
 	} bits;
 	unsigned char raw;
 };