add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/arch/arm/crypto/.gitignore
..
..
@@ -1,3 +1,4 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
1
2
 aesbs-core.S
2
3
 sha256-core.S
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4
 sha512-core.S