wifi hal layer on android

- wifi ap layer on Android
frameworks/base/core/jni/android_net_wifi_Wifi.cpp
framwworks/base/wifi/java/android/net/wifi/WifiStateTracker.java

- Wifi HAL layer
Android/hardware/libhardware_legacy/wifi/wifi.c

- Tool: wpa_suplicant and wpa_cli.c
external/wpa_supplicant/wpa_cli.c