x86: ivybridge: Set up XHCI USB

Add init for XHCI so that high-speed USB can be used.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/include/asm/arch-ivybridge/bd82x6x.h b/arch/x86/include/asm/arch-ivybridge/bd82x6x.h
index 2e6a079..6454dd9 100644
--- a/arch/x86/include/asm/arch-ivybridge/bd82x6x.h
+++ b/arch/x86/include/asm/arch-ivybridge/bd82x6x.h
@@ -11,6 +11,7 @@
 void bd82x6x_sata_enable(pci_dev_t dev, const void *blob, int node);
 void bd82x6x_pci_init(pci_dev_t dev);
 void bd82x6x_usb_ehci_init(pci_dev_t dev);
+void bd82x6x_usb_xhci_init(pci_dev_t dev);
 int bd82x6x_init_pci_devices(void);
 int bd82x6x_init(void);