add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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CONFIG_INIT=y
CONFIG_RUNLEVEL=y
CONFIG_FEATURE_USE_INITTAB=y
CONFIG_HALT=y
CONFIG_POWEROFF=y
CONFIG_FEATURE_KILL_DELAY=0
CONFIG_TELINIT_PATH=""
CONFIG_INIT_TERMINAL_TYPE=""