usb: zynq_udc: Patch to fix crash in OTG mode

IRQ spinlock needs to be taken before calling dr_controller_run().
Otherwise interupts are enabled before stopped bit is cleared
causing zynq_udc_irq() to return IRQ_NONE, which results in stacktrace
and irq53 being disabled by kernel.

Signed-off-by: Charles Baudouin <charles.baudouin@cobham.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>