V4L/DVB (11747): pvrusb2: Bump up version advertised through v4l interface

Kick up the pvrusb2 version number advertised through the v4l
interface.  This value really has almost no meaning because I don't
make a serious attempt to version the driver in this manner (otherwise
this one line becomes a nasty hotspot of changes and merge
conflicts).  The value that is here is really a historical thing.
However Hans Verkuil thought it might be a good idea to bump up the
number anyway right now since the driver's mechanism for communicating
with the v4l core has pretty much completely changed.  Sending out a

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>