drm/amd/display: use link_rate_set above DPCD 1.3 (#1527)

[Why & How]
According to eDP spec, DPCD 1.3 is only for eDP DPCD v1.4
In dpcd_set_link_settings function, the driver is just above v1.3
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: ChiawenHuang <chiawen.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

@@ -430,7 +430,7 @@ enum dc_status dpcd_set_link_settings(
 	status = core_link_write_dpcd(link, DP_LANE_COUNT_SET,
 		&lane_count_set.raw, 1);
 
-	if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_14 &&
+	if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_13 &&
 			lt_settings->link_settings.use_link_rate_set == true) {
 		rate = 0;
 		/* WA for some MUX chips that will power down with eDP and lose supported