V4L/DVB (5897): dtt200u: add support for the Miglia TVMini USB DVB-T adapter

add code for autodetection and firmware download to the Miglia TVMini USB
DVB-T adapter.  After firmware download, the device re-registers using
the WT220U_ZL0353_WARM usb id.

Signed-off-by: Rasmus Rohde <rohde@duff.dk>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>