add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/lib/xz/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 obj-$(CONFIG_XZ_DEC) += xz_dec.o
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 xz_dec-y := xz_dec_syms.o xz_dec_stream.o xz_dec_lzma2.o
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 xz_dec-$(CONFIG_XZ_DEC_BCJ) += xz_dec_bcj.o