add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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What:        /sys/kernel/notes
Date:        July 2009
Contact:    <linux-kernel@vger.kernel.org>
Description:    The /sys/kernel/notes file contains the binary representation
        of the running vmlinux's .notes section.