usb: musb: support ISO high bandwidth for gadget mode

This patch has been tested OK on beagle B5 board and
use usbtest #15 and #16 as testcase.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Anand Gadiyar <gadiyar@ti.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/musb/musb_gadget.h

@@ -79,6 +79,8 @@ struct musb_ep {
 
 	/* true if lock must be dropped but req_list may not be advanced */
 	u8				busy;
+
+	u8				hb_mult;
 };
 
 static inline struct musb_ep *to_musb_ep(struct usb_ep *ep)