disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/drivers/net/wireless/intersil/prism54/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 # $Id: Makefile.k26,v 1.7 2004/01/30 16:24:00 ajfa Exp $
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 prism54-objs := islpci_eth.o islpci_mgt.o \