media: coda: set codec earlier

The chosen codec depends on the coded format, which is known as soon as
the S_FMT call on the coded queue. This allows to use the codec in
callbacks that may be called before start_streaming, such as buf_queue.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>