Fix long-standing issue which prevented use of 24xxx devices at any
horizontal resolution other an 720.  The problem is in the cx25840
module, if no attempt is made to initialize VBI there.  Such a thing
should not be needed, but the pvrusb2 driver is updated now to deal
with this.
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>