usb: gadget: at91_udc: add at91_udc into U-Boot

add U-Boot specific changes to the at91_udc linux driver,
so it works with U-Boot.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 4c11a7e..6288ecf 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -10,6 +10,7 @@
 
 # new USB gadget layer dependencies
 ifdef CONFIG_USB_GADGET
+obj-$(CONFIG_USB_GADGET_AT91) += at91_udc.o
 obj-$(CONFIG_USB_GADGET_ATMEL_USBA) += atmel_usba_udc.o
 obj-$(CONFIG_USB_GADGET_BCM_UDC_OTG_PHY) += bcm_udc_otg_phy.o
 obj-$(CONFIG_USB_GADGET_S3C_UDC_OTG) += s3c_udc_otg.o