Support for USB Gadget on raspberry pi zero
The dwc2 kernel module are missing from linux-rpi for USB Gadget support on the raspberrpy pi zero and A+
Gadget mode should be enough, not sure we need USB host mode for zero and A+
maybe we need dwc2 device tree overlay as well?
something like this https://uniontownlabs.org/notebook/2015/12/17/dwc2-gadget-notes/
(from redmine: issue id 5629, created on 2016-05-26)