media: allegro: remove profile and level from channel

The profile and level are straight copies from the v4l2-ctrls. Avoid
duplication and directly read the value of the v4l2-ctrl.

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>