add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/drivers/idle/Makefile
..
..
@@ -1,2 +1,3 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
1
2
 obj-$(CONFIG_INTEL_IDLE)			+= intel_idle.o
2
3