recovery: add power modes

http://review.cyanogenmod.org/#/c/55208/

Change-Id: I5b588ced575b21f03f6e0a02c0eb34acc25be207
remove obsolete system properties

*dalvik cache is stored to data partition by default in cm11
*max background apps limit is unused in kitkat
*I think I can now remember what bt/wifi hardware this device has :P
*remove properties that don't do anything (or match default behaviour)

Change-Id: Ib3f07d7bfc1cd3f278fdf6742a7a71f2410f263a
use legacy qcom audio format

We don't use alsa audio but it needs to enabled to build.

Change-Id: I4156af9f3c4a0501f0a23f677c961aa8ca27a2ca
libaudio: update audio formats to new api

Change-Id: I6a7e370a079da88fd464c8e33ec3c5a372d896a9