add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_SOC_ZX296702) += zx296702.o zx296702-pm-domain.o
obj-$(CONFIG_SMP) += headsmp.o platsmp.o