[yocto] How to use usbinit?

[Chong Lu]

Hi all,

I built core-image-minimal and added usbinit package in this image.
I started usb-gether service and get following errors:

   Initializing g_ether gadget...
   modprobe: FATAL: Module g_ether not found.
   ifup: ignoring unknown interface usb0

I known g_ether module needs to add in image, but I didn't know whether 
has any features can enable it?

Best Regards
Chong