media: cedrus: Get rid of interrupt bottom-half

Now that the mem2mem framework guarantees that .device_run
won't be called from interrupt context, it is safe to call
v4l2_m2m_job_finish directly in the top-half.

So this means the bottom-half is no longer needed and we
can get rid of it.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>