delete some obsolete tweaks
disable camera hdr
FM Radio support

This is a combination of 7 commits:

FM Radio support (part 1)
si4708: configure de-emphasis according to selected band
FM radio support (part 2)
Fix FM audio routing
Build libfmradio by default
si4708: add RDS support
si4708: use mute IOCTL
libaudio: update for cm-10.1
disable hw acceleration on lockscreen