drm/amdgpu/jpeg4: properly set atomics vmid field

This needs to be set as well if the IB uses atomics.

Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit c6c2e8b6)
Cc: stable@vger.kernel.org