Some devices (Like Samsung Galaxy J6) has integrity check.
This means that all files outside of /system are signed by the OEM.
Since we replaced /sbin/adbd, that's an issue.
Workaround this by creating a new service, called adbd_system, which
will called instead of /sbin/adbd when needed
Android 8.1 added the support for new type of USB Audio devices
(USB_HEADSET, instead of old USB_DEVICE)
Some older USB devices got converted to this USB_HEADSET while still
using the old protocol.
There is no driver change needed, but the audio policy needs to be
changed.
Since vendors are simply using AOSP usb_audio_policy_configuration
Override it by ourself.
