Add more usb modules to kernel (usb audio class, bluetooth, human interface devices)

[VasylSamoilov]

As pluto supports usb otg mode (right now a mass storage devices are supported), it would be nice to add usb audio class device modules, and maybe bluetooth and hid (keyboard, mice) so pluto can record and output audio converting it to stand-alone transceiver with human interface.

[VasylSamoilov]

btw tezuka firmware from F5OEO implements it in reverse - pluto presents itself as usb audio gadget :) which is also nice. replaces the need for virtual audio cable.
https://github.com/F5OEO/tezuka_fw