[media] av7110: Fix driver name

This patch changes the name of the av7110  driver from the
generic "dvb" to "av7110", to be descriptive of the driver.

I've included Oliver Endriss's ack from the original post, which
contained a mangled patch.  The content of the patch is unchanged.

Signed-off-by: Derek Kelly <user.vdr@gmail.com>
Acked-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>