remove CEC support

cec is miserably broken for me (pulse8 cec adapter)

TODO: test after one year

things I would like to see working:
- propper reinitialization after usb disconnect
- propper reinitialization after enable/disable in xbmc -> peripherals
- shutdown functions wroking with my lg tv
- less than 500ms lag. atm it's not acceptable
- something I dont remember anymore, as the adapter is thrown away.

til then, its not worth supporting