add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/kernel/vdso/.gitignore
..
..
@@ -1,2 +1,4 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
1
2
 vdso.lds
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3
 *.tmp
4
+vdso-syms.S