drm/amd/powerplay: notify smu once display changed on Rv.

when User turn off display or screen idle timeout,
smu need this message to start S0i2 entry.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 files changed