add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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config BR2_PACKAGE_UNIXBENCH
    bool "UnixBench"
    select BR2_PACKAGE_PERL
    select BR2_PACKAGE_MAKE
    help
 
    UnixBench is the original BYTE UNIX benchmark suite, updated and
    revised by many people over the years.
 
    https://github.com/kdlucas/byte-unixbench