usb: gadget: ecm: Add IAD descriptor in SS mode

Commit d11519 ("usb: gadget: Add Interface Association Descriptor to
ECM") added the IAD descriptor to FS and HS descriptors. The SS
descriptor has been left out probably because it has been added "just
recently".
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/f_ecm.c

@@ -330,6 +330,7 @@ static struct usb_ss_ep_comp_descriptor ss_ecm_bulk_comp_desc = {
 
 static struct usb_descriptor_header *ecm_ss_function[] = {
 	/* CDC ECM control descriptors */
+	(struct usb_descriptor_header *) &ecm_iad_descriptor,
 	(struct usb_descriptor_header *) &ecm_control_intf,
 	(struct usb_descriptor_header *) &ecm_header_desc,
 	(struct usb_descriptor_header *) &ecm_union_desc,