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.
You'll need to call generate.sh in this folder to generate the Makefiles to build the Treble targets
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