board: ti: beagle_x15: added USB initializtion code
Implemented board_usb_init(), board_usb_cleanup() and usb_gadget_handle_interrupts() in beagle_x15 board file that can be invoked by various gadget drivers. Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com> Reviewed-by: NTom Rini <trini@konsulko.com>
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