disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/drivers/staging/axis-fifo/Makefile
..
..
@@ -1 +1,2 @@
1
+# SPDX-License-Identifier: GPL-2.0
1
2
 obj-$(CONFIG_XIL_AXIS_FIFO) += axis-fifo.o