add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/sound/pci/aw2/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 snd-aw2-objs := aw2-alsa.o aw2-saa7146.o
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 obj-$(CONFIG_SND_AW2) += snd-aw2.o