drm/amd/display: Assign stream status for FPO + Vactive cases

A new check was added to ensure FPO is not enabled when the FPO pipe has
0 planes. This requires the stream status to check the plane count, but
the stream status was not assigned for FPO + Vactive cases which leads
to FPO not be enabled always.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Relja Vojvodic <relja.vojvodic@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c

@@ -554,7 +554,8 @@ struct dc_stream_state *dcn32_can_support_mclk_switch_using_fw_based_vblank_stre
 		DC_FP_START();
 		dcn32_assign_fpo_vactive_candidate(dc, context, &fpo_candidate_stream);
 		DC_FP_END();
-
+		if (fpo_candidate_stream)
+			fpo_stream_status = dc_state_get_stream_status(context, fpo_candidate_stream);
 		DC_FP_START();
 		is_fpo_vactive = dcn32_find_vactive_pipe(dc, context, dc->debug.fpo_vactive_min_active_margin_us);
 		DC_FP_END();