CEC service: firmware: only kill interface when the last client has disconnected
See http://forum.stmlabs.com/showthread.php?tid=11053

firmware: gencmd: Add option to enable force_audio at runtime

firmware: audioplus: Need to close/open a forced hdmi output when channels change

bootcode: Updates to speed up bootocode sdcard accesses from gsh

firmware: devtree: populate /axi/vc_mem/reg
See: https://github.com/raspberrypi/linux/issues/381

firmware: audio: Updates to support multichannel hdmi audio more accurately

linux: bump to 3.10.17