V4L/DVB (13225): pvrusb2: Report hardware description to kernel log upon initialization

The driver also contains a piece of configuration data that produces a
one line description of the specific hardware being driver
(e.g. "Hauppauge 24xxx", "OnAir", etc).  This change generates an
informational message to the kernel log reporting the hardware type
being driven.  This is a very useful thing to know when diagnosing
problems.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>