disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/arch/sh/boards/mach-ap325rxa/Makefile
..
..
@@ -1,2 +1,3 @@
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+# SPDX-License-Identifier: GPL-2.0
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 obj-y	 := setup.o sdram.o
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