use amdgpu_gfx_off_ctrl function so driver can arbitrate
whether the gfx ip can be power off or power on.
Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>