policy: Offload enhancements

 * Port changes from audio-caf to the generic HAL to bring
   support for these features to more devices.

Change-Id: I74ff10dd7574498654d4771a74285e0875dd8580
wifi: add presto changes

Import wifi changes from presto repository

Change-Id: I515f5171d22fbbc132f0f0504c33153671b6e1af
wifi: Add option for a device-specific wifi

This patch adds TARGET_CUSTOM_WIFI which can be used to replace the
standard wifi.c with a custom implementation without breaking things
for devices that assume default functionality. (Derived from
Gingerbread:566d2f2)

Change-Id: Ief8c51c4c33f879c7771af8769c83f1f89979034