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/am43xx_evm.h b/include/configs/am43xx_evm.h
index 33e534a..ccdfb9c 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -110,6 +110,7 @@
 #define CONFIG_CMD_USB
 #define CONFIG_USB_HOST
 #define CONFIG_USB_XHCI
+#define CONFIG_USB_XHCI_DWC3
 #define CONFIG_USB_XHCI_OMAP
 #define CONFIG_USB_STORAGE
 #define CONFIG_SYS_USB_XHCI_MAX_ROOT_PORTS 2