drm/amd/display: Add DSC guard to dcn3 function pointer

The function pointer is not defined without the DSC config flag

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Kent Russell <kent.russell@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

@@ -2438,7 +2438,9 @@ static const struct resource_funcs dcn30_res_pool_funcs = {
 	.populate_dml_pipes = dcn30_populate_dml_pipes_from_context,
 	.acquire_idle_pipe_for_layer = dcn20_acquire_idle_pipe_for_layer,
 	.add_stream_to_ctx = dcn30_add_stream_to_ctx,
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
 	.add_dsc_to_stream_resource = dcn20_add_dsc_to_stream_resource,
+#endif
 	.remove_stream_from_ctx = dcn20_remove_stream_from_ctx,
 	.populate_dml_writeback_from_context = dcn30_populate_dml_writeback_from_context,
 	.set_mcif_arb_params = dcn30_set_mcif_arb_params,