drm/amd/display: Add p_state_change_support flag to dc_clocks

Will be used to signify if P-state change is supported.
Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -203,6 +203,7 @@ struct dc_clocks {
 	int fclk_khz;
 	int phyclk_khz;
 	int dramclk_khz;
+	bool p_state_change_support;
 };
 
 struct dc_debug_options {