wifi: add a new "loading" state

Set wlan.driver.status to "loading" in wifi_load_driver to allow
external action being triggered by property change.

Change-Id: I72004b8b5bc711ea83cc7ae4b6a39382c05cb02f
 u8500: add ST Ericsson audio configs

to enable add STE_AUDIO

ported from commit 7195777bc255820e60c008c3be52d3969e15f0b2

Change-Id: I9689c73b8aa8300f3268f4d41ef1407d7e0bf3d0
Merge branch 'jellybean' into JBMP