media: staging: rkisp1: initialize buffer lists only on probe

The buffer lists of stats and params entities
are initialized in queue_setup callback with
'INIT_LIST_HEAD'. It is enough to initialize
the lists only upon registration.
For the stats entity the list is already
initialize upon registration.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>