drm/amdgpu/vcn2.0: add cancel_delayed_work_sync before power gate

drm/amdgpu/vcn2.0: add cancel_delayed_work_sync before power gate

commit 0c6013377b4027e69d8f3e63b6bf556b6cb87802 upstream.

Add cancel_delayed_work_sync before set power gating state
to avoid race condition issue when power gating.

Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>