add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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config BR2_PACKAGE_MATCHBOX_FAKEKEY
    bool "matchbox-fakekey"
    select BR2_PACKAGE_MATCHBOX_LIB
    select BR2_PACKAGE_XLIB_LIBXTST
    help
      Library for simulating key press events under X11.