add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/include/linux/license.h
..
..
@@ -1,3 +1,4 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
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2
 #ifndef __LICENSE_H
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3
 #define __LICENSE_H
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4