USB: gadget: Initialize ci13xxx gadget device's coherent DMA mask

dma_alloc_coherent() which is internally called by dma_pool_alloc()
flags a warning if device's coherent DMA mask.  Hence initialize
gadget device's coherent DMA mask to it's parent mask.
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/ci13xxx_udc.c

@@ -2624,6 +2624,7 @@ static int udc_probe(struct device *dev, void __iomem *regs, const char *name)
 
 	dev_set_name(&udc->gadget.dev, "gadget");
 	udc->gadget.dev.dma_mask = dev->dma_mask;
+	udc->gadget.dev.coherent_dma_mask = dev->coherent_dma_mask;
 	udc->gadget.dev.parent   = dev;
 	udc->gadget.dev.release  = udc_release;