usb/xhci: unify parameter of xhci_msi_irq

According to Felipe and Alan's comments the second parameter of irq
handler should be 'void *' not a specific structure pointer.
So change it.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/host/xhci-ring.c

@@ -2799,7 +2799,7 @@ hw_died:
 	return IRQ_HANDLED;
 }
 
-irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
+irqreturn_t xhci_msi_irq(int irq, void *hcd)
 {
 	return xhci_irq(hcd);
 }