usb: add host support for the tilegx architecture

This change adds OHCI and EHCI support for the tilegx's on-chip
USB hardware.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile
index 49d4ce3..5334be8 100644
--- a/arch/tile/kernel/Makefile
+++ b/arch/tile/kernel/Makefile
@@ -19,3 +19,4 @@
 else
 obj-$(CONFIG_PCI)		+= pci.o
 endif
+obj-$(CONFIG_TILE_USB)		+= usb.o