Pantherpoint: Add XHCI device init

This enables power management and clock gating on XHCI.

Change-Id: I124ea6c5aca034b7ec4b5286d971c2adfce25c88
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/2761
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/southbridge/intel/bd82x6x/Makefile.inc b/src/southbridge/intel/bd82x6x/Makefile.inc
index 0b0385b..e921bc1 100644
--- a/src/southbridge/intel/bd82x6x/Makefile.inc
+++ b/src/southbridge/intel/bd82x6x/Makefile.inc
@@ -29,6 +29,7 @@
 ramstage-y += pcie.c
 ramstage-y += sata.c
 ramstage-y += usb_ehci.c
+ramstage-y += usb_xhci.c
 ramstage-y += me.c
 ramstage-y += me_8.x.c
 ramstage-y += smbus.c