By this commit USB audio class implementation is introduced
to Zephyr.
The Zephyr USB audio device class follows bellow
documentations:
- Universal Serial Bus specification rev2.0 (usb20.pdf)
- Universal Serial Bus Device Class Definition for Audio Devices
(audio10.pdf)
- Universal Serial Bus Device Class Definition for Audio Data Formats
(frmts10.pdf)
- Universal Serial Bus Device Class Definition for Terminal Types
(termt10.pdf)
Signed-off-by: Emil Obalski <emil.obalski@nordicsemi.no>
8d2f13c203