media: hantro: output encoded JPEG content directly to capture buffers

Now that the JPEG header length is aligned with bus access boundaries,
the JPEG encoder can output to the capture buffers directly without
going through a bounce buffer.

Do just that, and get rid of all the bounce buffer related code.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>