add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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LEGOEV3 BOARD
M:    David Lechner <david@lechnology.com>
S:    Maintained
F:    board/lego/ev3/
F:    include/configs/legoev3.h
F:    configs/legoev3_defconfig