Disable GL scissor optimization for crespo (SGX540)

Change-Id: I214f9a92ba7b866d9a47cf1dcb6dc5357e71352a
audio: add device specific audio_effects.conf file

Audio preprocessors are no longer included in the default
audio_effects.conf as of 4.2, so add an audio_effects.conf exposing the
effects that are supported by crespo.

Change-Id: I6d1da294b775bf732026f0b98b6b1d6fe2bafe5d
Update media_codecs.xml for 4.3

* Add GSM decoder explicity
* Add VPX encoder (now required for 4.3 compatibility)

Change-Id: Ifc7cf1afdfa01871e349b41eda7e63a39674616d
add location and backup overlay

Credit to steven676
Turn off BLE, GATT, and SMP of Bluetooth stack
Limit the number of background apps