V4L/DVB (5605): M920x: Add support for LifeView TV Walker Twin

Add support for "LifeView TV Walker Twin" (USB IDs 10fd:0513, 10fd:0514)

Signed-off-by: Nick Andrew <nick@nick-andrew.net>
Signed-off-by: Aapo Tahkola <aet@rasterburn.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>