add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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M53EVK BOARD
#M:    Marek Vasut <marek.vasut@gmail.com>
S:    Orphan (since 2017-07)
F:    board/aries/m53evk/
F:    include/configs/m53evk.h
F:    configs/m53evk_defconfig