V4L/DVB (13946): proc_fops: convert av7110

Drop S_IRUGO, proc entry doesn't contain read hooks.
Drop S_IFREG, simply unnecessary.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>