USB ehci core support

Add USB ehci core support

Signed-off-by: Michael Trimarchi <trimarchi@gandalf.sssup.it>
Signed-off-by: Remy Böhmer <linux@bohmer.net>
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 856f51a..fbc6521 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -28,6 +28,7 @@
 # core
 COBJS-y += usbdcore.o
 COBJS-$(CONFIG_USB_OHCI_NEW) += usb_ohci.o
+COBJS-$(CONFIG_USB_EHCI) += usb_ehci_core.o
 
 # host
 COBJS-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o