fix wifi

1. wifi direct is removed due we need to port new kernel with __p2pdev support
2. removed /data/system/wpa_supplicant existence since it cause a mess if we using private socket. See wifi.c in hardware legacy. So combination with private socket need non existence of the folder in /data/system/wpa_supplicant... see android:wpa_***
3. using /system/etc/wifi/* instead og generated one from /data/misc/wifi
4. p2p supplicant now is unused due to missing p2pdev support
5. wifi tethering is working too