drm/amd/display: DSC passthrough is for DP-HDMI pcon (SST pcon)

if check over DSC passthrough is removed, as this is not for
MST use case. It is for DP-HDMI pcon use case. sst pcon is
detected as sst not mst. In sst pcon dsc passthrough message
will not get below log printed

Fixes: 9b035d08 ("drm/amd/display: Check & log if receiver supports MST, DSC & FEC.")
Suggested-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

@@ -1820,9 +1820,8 @@ static bool retrieve_link_cap(struct dc_link *link)
 				  str_yes_no(is_fec_supported));
 			DC_LOG_DC("%s: DSC_Basic_Sink_Support: %s\n", __func__,
 				  str_yes_no(is_dsc_basic_supported));
-			if (link->dpcd_caps.is_mst_capable)
-				DC_LOG_DC("%s: DSC_Passthrough_Sink_Support: %s\n", __func__,
-					  str_yes_no(is_dsc_passthrough_supported));
+			DC_LOG_DC("%s: DSC_Passthrough_Sink_Support: %s\n", __func__,
+				  str_yes_no(is_dsc_passthrough_supported));
 		}
 		if (link->dpcd_caps.dongle_type != DISPLAY_DONGLE_NONE) {
 			status = core_link_read_dpcd(