usb: dwc3: omap: do not enable DMA Disable Clear IRQ

Otherwise that IRQ will trigger forever. It's quite
unnecessary.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/dwc3-omap.c

@@ -313,8 +313,7 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 	/* enable all IRQs */
 	dwc3_writel(omap->base, USBOTGSS_IRQENABLE_SET_0, 0x01);
 
-	reg = (USBOTGSS_IRQ1_DMADISABLECLR |
-			USBOTGSS_IRQ1_OEVT |
+	reg = (USBOTGSS_IRQ1_OEVT |
 			USBOTGSS_IRQ1_DRVVBUS_RISE |
 			USBOTGSS_IRQ1_CHRGVBUS_RISE |
 			USBOTGSS_IRQ1_DISCHRGVBUS_RISE |