drm/amd/display: copy dmub caps to dc on dcn31

[Why & How]
Add code path to copy dmub caps to dc, which is missing on dcn31

Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Josip Pavic <Josip.Pavic@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/dcn31/dcn31_hwseq.c

@@ -295,6 +295,10 @@ void dcn31_init_hw(struct dc *dc)
 	if (dc->res_pool->hubbub->funcs->init_crb)
 		dc->res_pool->hubbub->funcs->init_crb(dc->res_pool->hubbub);
 #endif
+
+	// Get DMCUB capabilities
+	dc_dmub_srv_query_caps_cmd(dc->ctx->dmub_srv->dmub);
+	dc->caps.dmub_caps.psr = dc->ctx->dmub_srv->dmub->feature_caps.psr;
 }
 
 void dcn31_dsc_pg_control(