V4L/DVB: media: dvb/af9015, add hashes support

So as a final patch, add support for hash and one hash entry
for MSI digi vox mini II:
iManufacturer 1 Afatech
iProduct      2 DVB-T 2
iSerial       3 010101010600001

It is now handled with proper IR and key map tables.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>