doc: dt-binding: usb: add otg related properties
Add otg version, srp, hnp and adp support for usb OTG port, then those OTG features don't have to be decided by usb gadget drivers. Signed-off-by: NLi Jun <jun.li@freescale.com> Reviewed-by: NRoger Quadros <rogerq@ti.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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