usb: gadget: make config_item_type structures const

Make these structures const as they are only passed to the const
argument of the functions config_{group/item}_init_type_name.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/usb/gadget/function/f_uac1_legacy.c b/drivers/usb/gadget/function/f_uac1_legacy.c
index 5d229e7..178fd12 100644
--- a/drivers/usb/gadget/function/f_uac1_legacy.c
+++ b/drivers/usb/gadget/function/f_uac1_legacy.c
@@ -921,7 +921,7 @@ static struct configfs_attribute *f_uac1_attrs[] = {
 	NULL,
 };
 
-static struct config_item_type f_uac1_func_type = {
+static const struct config_item_type f_uac1_func_type = {
 	.ct_item_ops	= &f_uac1_item_ops,
 	.ct_attrs	= f_uac1_attrs,
 	.ct_owner	= THIS_MODULE,