usb: xhci: Expose xhci_start() function.

Change the visability of xhci_start() so that it
can be used when enabling test mode.

Signed-off-by: Guoqing Zhang <guoqing.zhang@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 8cfafdc..7b9d3ad 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -125,7 +125,7 @@ int xhci_halt(struct xhci_hcd *xhci)
 /*
  * Set the run bit and wait for the host to be running.
  */
-static int xhci_start(struct xhci_hcd *xhci)
+int xhci_start(struct xhci_hcd *xhci)
 {
 	u32 temp;
 	int ret;