MX31: Add support for MXC EHCI controller

The patch adds the EHCI controller for the i.MX31 Soc.

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 255679a..399520e 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -36,6 +36,7 @@
 # echi
 COBJS-$(CONFIG_USB_EHCI) += ehci-hcd.o
 COBJS-$(CONFIG_USB_EHCI_FSL) += ehci-fsl.o
+COBJS-$(CONFIG_USB_EHCI_MXC) += ehci-mxc.o
 COBJS-$(CONFIG_USB_EHCI_PPC4XX) += ehci-ppc4xx.o
 COBJS-$(CONFIG_USB_EHCI_IXP4XX) += ehci-ixp.o
 COBJS-$(CONFIG_USB_EHCI_KIRKWOOD) += ehci-kirkwood.o