drm/amd/display: Fix DP-DVI dongle hotplug

[why]
Hotplugging with a DVI-DP dongle on pre-rdna embedded platform
working about half the time. The regression was found to be the
setting of link->type here.
[what]
Reverts fix besides the logging added.
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Gabe Teeger <gabe.teeger@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/link/link_detection.c

@@ -863,7 +863,6 @@ static bool detect_link_and_local_sink(struct dc_link *link,
 	struct dc_sink *prev_sink = NULL;
 	struct dpcd_caps prev_dpcd_caps;
 	enum dc_connection_type new_connection_type = dc_connection_none;
-	enum dc_connection_type pre_connection_type = link->type;
 	const uint32_t post_oui_delay = 30; // 30ms
 
 	DC_LOGGER_INIT(link->ctx->logger);
@@ -965,7 +964,6 @@ static bool detect_link_and_local_sink(struct dc_link *link,
 			}
 
 			if (!detect_dp(link, &sink_caps, reason)) {
-				link->type = pre_connection_type;
 
 				if (prev_sink)
 					dc_sink_release(prev_sink);
@@ -1299,8 +1297,7 @@ bool link_detect(struct dc_link *link, enum dc_detect_reason reason)
 			link->dpcd_caps.is_mst_capable)
 		is_delegated_to_mst_top_mgr = discover_dp_mst_topology(link, reason);
 
-	if (is_local_sink_detect_success &&
-			pre_link_type == dc_connection_mst_branch &&
+	if (pre_link_type == dc_connection_mst_branch &&
 			link->type != dc_connection_mst_branch)
 		is_delegated_to_mst_top_mgr = link_reset_cur_dp_mst_topology(link);