media: allegro: handle dependency of bitrate and bitrate_peak

The peak bitrate must not be smaller than the configured bitrate. Update
the other control whenever one of the controls changes to reflect this
dependency.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>