usb/host: introduce USB_ARCH_HAS_XHCI

to make it look like OHCI and EHCI, we introduce
that symbol and USB_XHCI_HCD depend on that
instead of PCI.

[bigeasy@linutronix.de: wire up USB_ARCH_HAS_HCD]

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/Kconfig

@@ -19,7 +19,7 @@ config USB_C67X00_HCD
 
 config USB_XHCI_HCD
 	tristate "xHCI HCD (USB 3.0) support (EXPERIMENTAL)"
-	depends on USB && PCI && EXPERIMENTAL
+	depends on USB && USB_ARCH_HAS_XHCI && EXPERIMENTAL
 	---help---
 	  The eXtensible Host Controller Interface (xHCI) is standard for USB 3.0
 	  "SuperSpeed" host controller hardware.