drm/amdgpu/display/dc: add FBC to dc_config

Add FBC to the list of features that can be enabled from the DM.
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc.h

@@ -169,6 +169,7 @@ struct link_training_settings;
 struct dc_config {
 	bool gpu_vm_support;
 	bool disable_disp_pll_sharing;
+	bool fbc_support;
 };
 
 enum visual_confirm {