update dreambox hardware drivers for dm920, dm900, dm7080, dm820
- add support for dreambox bluetooth remote control (dm920, dm900, dm7080)
- add support for silabs DVB-S2X single tuner module
- fix possible race condition on open/close audio/video encoder from different processes (dm7080, dm820)
dreambox-dvb-modules: update dm920 drivers
- fixed possible data transport problems when two FBC tuners are in use and a bcm45308x is inserted into the second tuner slot