add firmware and drivers for DVBSky cards/boxes

Hi Christopher,

These packages contain the firmware and the customized media-build tree for dvbsky cards/boxes, which unfortunately have not found it's way into mainline.

* Would you like to see this in a split package? The firmware is quasi static, the media-build tree has to be rebuilt on every kernel change.
* Maybe all firmware/driver stuff (e.g. ngene-firmware) should be moved to a new directory.

Cheers, Ole