freedreno/drm: Submit should hold ref to device
What does this MR do and why?
freedreno/drm: Submit should hold ref to device
Prevent the device from being deleted prior to submit cleanup.
Otherwise submit cleanup can try to reference an already free'd
device (and use already closed rendernode fd, etc).
Fixes: ("e6b2785811c2 freedreno/drm/virtio: Use userspace IOVA allocation")
Signed-off-by: Rob Clark <robdclark@chromium.org>