drm/amd/display: enable clock gating and dchubp power gating

also refactor to clean reduce loc to achieve same logic
Signed-off-by: NTony Cheng <tony.cheng@amd.com>
Acked-by: NHarry Wentland <Harry.Wentland@amd.com>
Reviewed-by: NYongqiang Sun <yongqiang.sun@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -145,7 +145,8 @@ struct dc_debug {
 	bool disable_stutter;
 	bool disable_dcc;
 	bool disable_dfs_bypass;
-	bool disable_power_gate;
+	bool disable_dpp_power_gate;
+	bool disable_hubp_power_gate;
 	bool disable_clock_gate;
 	bool disable_dmcu;
 	bool disable_color_module;