V4L/DVB (9484): v4l: rename compat_ioctl32.c to v4l2-compat-ioctl32.c

All core v4l sources should start with 'v4l2-'
This file was the last one for which this was not the case.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>