usb: renesas_usbhs: use delayed_work instead of work_struct

This delay is used to overjump debounce.

And, this patch also move usbhsc_drvcllbck_notify_hotplug to global,
because it will be called from other files.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/include/linux/usb/renesas_usbhs.h b/include/linux/usb/renesas_usbhs.h
index 66bbdd1..3a7f1d9 100644
--- a/include/linux/usb/renesas_usbhs.h
+++ b/include/linux/usb/renesas_usbhs.h
@@ -103,6 +103,13 @@
 	 * for BUSWAIT :: BWAIT
 	 * */
 	int buswait_bwait;
+
+	/*
+	 * option:
+	 *
+	 * delay time from notify_hotplug callback
+	 */
+	int detection_delay;
 };
 
 /*