drm/amd/display: destroy panel on link destruct

[Why]
without destroy it is causing a memory leak

[How]
destroy panel on link destruct
Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Wyatt Wood <Wyatt.Wood@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -88,6 +88,9 @@ static void dc_link_destruct(struct dc_link *link)
 	if (link->ddc)
 		dal_ddc_service_destroy(&link->ddc);
 
+	if (link->panel)
+		link->panel->funcs->destroy(&link->panel);
+
 	if (link->link_enc)
 		link->link_enc->funcs->destroy(&link->link_enc);