usb: Initialize hcd->state roothubs.

We would like to allow host controller drivers to stop using hcd->state.
Unfortunately, some host controller drivers use hcd->state as an
implicit way of telling the core that a controller has died.  The
roothub registration functions must assume the host died if hcd->state
equals HC_STATE_HALT.

To facilitate drivers that don't want to set hcd->state to
HC_STATE_RUNNING in their initialization routines, we set the state to
running before calling the host controller's start function.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/core/hcd.c

@@ -2347,6 +2347,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 					(unsigned long long)hcd->rsrc_start);
 	}
 
+	hcd->state = HC_STATE_RUNNING;
 	retval = hcd->driver->start(hcd);
 	if (retval < 0) {
 		dev_err(hcd->self.controller, "startup error %d\n", retval);