s3c64xx: move usb driver to drivers/usb

add CONFIG_USB_S3C64XX to activate the driver

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index b306a65..7ddb72a 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -33,6 +33,7 @@
 # host
 COBJS-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
 COBJS-$(CONFIG_USB_R8A66597_HCD) += r8a66597-hcd.o
+COBJS-$(CONFIG_USB_S3C64XX) += s3c64xx_usb.o
 COBJS-$(CONFIG_USB_SL811HS) += sl811_usb.o
 COBJS-$(CONFIG_USB_EHCI_FSL) += usb_ehci_fsl.o
 COBJS-$(CONFIG_USB_EHCI_PCI) += usb_ehci_pci.o