add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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MX6BOARDS BOARD
M:    Eric Bénard <eric@eukrea.com>
S:    Maintained
F:    board/embest/mx6boards/
F:    include/configs/embestmx6boards.h
F:    configs/marsboard_defconfig
F:    configs/riotboard_defconfig