drm/amd/display: Skip DIG Check if Link is Virtual for Display Count

[WHY]
Without a check for virtual links, every link's DIG was getting
checked for enabled or disabled. If link was virtual, since it
did not have a DIG, this would cause issues.

[HOW]
Skip DIG Enable check if link is virtual and add virtual link to
to display count.
Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@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/clk_mgr/dcn21/rn_clk_mgr.c

@@ -79,7 +79,8 @@ int rn_get_active_display_cnt_wa(
 		 * S0i2.
 		 */
 		/* abusing the fact that the dig and phy are coupled to see if the phy is enabled */
-		if (link->link_enc->funcs->is_dig_enabled(link->link_enc))
+		if (link->connector_signal == SIGNAL_TYPE_VIRTUAL ||
+				link->link_enc->funcs->is_dig_enabled(link->link_enc))
 			display_count++;
 	}