V4L/DVB (12083): ov511: remove ov518 usb id's from the driver

ov511: remove ov518 usb id's from the driver, as they have not been working
ever since the decompression code got removed from the kernel, and they
are no supported by the gspca_ov519 module.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>