add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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GONI BOARD
M:    Robert Baldyga <r.baldyga@samsung.com>
S:    Maintained
F:    board/samsung/goni/
F:    include/configs/s5p_goni.h
F:    configs/s5p_goni_defconfig