add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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BR2_arm=y
BR2_cortex_a35=y
BR2_ARM_FPU_VFPV4=y
BR2_PACKAGE_RK1806=y
BR2_ROOTFS_OVERLAY="board/rockchip/rk1806/fs-overlay-32/"