Ezequiel Garcia 5525b83143 media: mem2mem: Make .job_abort optional
Implementing job_abort() does not make sense on some drivers.
This is not a problem, as the abort is not required to
wait for the job to finish. Quite the opposite, drivers
are encouraged not to wait.

Demote v4l2_m2m_ops.job_abort from required to optional, and
clean all drivers with dummy implementations.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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