I9100G: Add wpa/p2p_supplicant overlays && Update Wi-Fi init props

Updated props taken from Grouper.
I9100G: Update internal storage support

See: http://source.android.com/devices/tech/storage/config-example.html

Credits to Steven Luo (steven676) for this.
I9100G: Add loudness_enhancer audio effect && Unbork previously implemented effects
I9100G: Update overlays

Comment out functions that aren't implemented for now.
I9100G: Update VP8 codec name, enable VP9 decoder
Actually copy wpa/p2p supplicant overlays