V4L/DVB (11679): cafe_ccic: fix sensor detection

Due to an uninitialized chip.ident field the chip identification failed.

Thanks-to: Saeed Bishara <saeed.bishara@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>