boardconfig: Build power and standardize charging mode

-From https://github.com/Team-Exhibit/android_device_samsung_codinaxxx/commit/e437581cb9fe46b835fdf74c09fe0cbc954d9e73
gps: restore stock sirfgps.conf
audio: update our custom audio.h include

-Differential from hardware/libhardware/include/audio.h

-Fixes a build error