media: atomisp: Remove vidioc_g/s callback

The v4l2 ioctl framework can implement vidioc_g/s_ctrl with
vidioc_g/s_ext_ctrl() and we provide those.

These are the last references of vidioc_s/g_ctrl in the codebase. We can
attempt to remove them now.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>