add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/kernel/reboot.c
..
..
@@ -307,8 +307,11 @@
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  *
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  *	Shutdown everything and perform a clean system power_off.
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  */
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+extern void nkmcu_device_shutdown(void);
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 void kernel_power_off(void)
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 {
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+	pr_emerg("nkmcu kernel_power_off... \n");
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+	nkmcu_device_shutdown();
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 	kernel_shutdown_prepare(SYSTEM_POWER_OFF);
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 	if (pm_power_off_prepare)
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 		pm_power_off_prepare();