freedreno/drm: Fix teardown crash harder
What does this MR do and why?
freedreno/drm: Fix teardown crash harder
We need to unref the device *after* submit cleanup, so that
fd_submit_sp_destory() can still reference the device.
Fixes: d558cb664a68 ("freedreno/drm: Submit should hold ref to device")
Signed-off-by: Rob Clark <robdclark@chromium.org>