a3: some ril fixes to get it out of airplane mode.
board: add prekitkat policy blob define.
a3: wifi - show macaddr in settings. wifi - store country code.

code heavily inspired by the wpa_supplicant8_ti code.
overlay: enable soft reboot
a3: first shot at BT (some thx go to arcee)
a3: less muxd spam in logcat
a3: select BT tethering interface
a3: bump up bt a2dp MTU