Add support for various Hauppauge EXETER designs.

Note by DJH: fixed a few minor 'make checkpatch' warnings before commit.
Signed-off-by: NMichael Krufky <mkrufky@kernellabs.com>
Signed-off-by: NDevin Heitmueller <dheitmueller@hauppauge.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>