usb: r8a66597-hcd: constify hc_driver structures

The hc_driver structure is only passed as the first argument to
usb_create_hcd, which is declared as const.  Thus the hc_driver structure
itself can be const.

Done with the help of Coccinelle.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/r8a66597-hcd.c

@@ -2312,7 +2312,7 @@ static int r8a66597_bus_resume(struct usb_hcd *hcd)
 #define	r8a66597_bus_resume	NULL
 #endif
 
-static struct hc_driver r8a66597_hc_driver = {
+static const struct hc_driver r8a66597_hc_driver = {
 	.description =		hcd_name,
 	.hcd_priv_size =	sizeof(struct r8a66597),
 	.irq =			r8a66597_irq,