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>

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;

drivers/usb/host/xhci.h

@@ -2010,6 +2010,7 @@ typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *);
 int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec);
 void xhci_quiesce(struct xhci_hcd *xhci);
 int xhci_halt(struct xhci_hcd *xhci);
+int xhci_start(struct xhci_hcd *xhci);
 int xhci_reset(struct xhci_hcd *xhci);
 int xhci_init(struct usb_hcd *hcd);
 int xhci_run(struct usb_hcd *hcd);