[media] dvb_usb_v2: Cypress firmware download module

Firmware handling routines for various Cypress chips.
Cypress AN2135
Cypress AN2235
Cypress FX2

These were split out from general DVB USB module by
Patrick Boettcher. I did only small changes.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>