Allocate and initialize usb otg descriptor according to gadget otg
capabilities, add it for each usb configurations. If otg capability
is not defined, keep its original otg descriptor unchanged.
Reviewed-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NLi Jun <jun.li@freescale.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>