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Move pthread creation to init_vq, and kill the thread in exit_vq.
Initialize the virtqueue states at runtime.

All in-flight I/O is canceled with the virtqueue pthreads, except for AIO
threads, but after reading the code I'm not sure if AIO has ever worked
anyway.
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>