media: allegro: change kernel-doc comment blocks to normal comments

The /** at the start indicates that these are kernel-doc comments, but
really these are just regular comments.

Replace /** by /* to avoid a large number of warnings from kernel-doc.

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