add smu_notify_display_change function to send msg to smc to notify
display is changed.
Signed-off-by: NKevin Wang <Kevin1.Wang@amd.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>