usb: xhci: omap: Remove common dwc3 drv functions calls

Remove all redundant dwc3 driver function calls that
are defined by dwc3 driver

Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
diff --git a/include/configs/beagle_x15.h b/include/configs/beagle_x15.h
index 17fdded..d38b7b5 100644
--- a/include/configs/beagle_x15.h
+++ b/include/configs/beagle_x15.h
@@ -68,6 +68,7 @@
 /* USB xHCI HOST */
 #define CONFIG_CMD_USB
 #define CONFIG_USB_HOST
+#define CONFIG_USB_XHCI_DWC3
 #define CONFIG_USB_XHCI
 #define CONFIG_USB_XHCI_OMAP
 #define CONFIG_USB_STORAGE