[media] get_dvb_firmware: add entry for the vp7049 firmware

Add an entry to download the dvb-usb-vp7049-0.95.fw firmware for the
Twinhan vp7049 and similar devices.
Known devices of this kind are:
  Twinhan/Azurewave DTV-DVB UDTT7049
  Digicom Digitune-S
  Think Xtra Hollywood DVB-T USB2.0

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>