virgl: remove virgl_transfer_queue_lists

COMPLETED_LIST is always empty.  We only need one list.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
10 jobs for !1294 with virgl-transfer-queue-cleanup in 27 minutes and 26 seconds (queued for 4 minutes and 45 seconds)
merge request