add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/include/linux/videodev2.h
..
..
@@ -57,6 +57,7 @@
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 #define __LINUX_VIDEODEV2_H
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 #include <linux/time.h>     /* need struct timeval */
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+#include <linux/kernel.h>
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 #include <uapi/linux/videodev2.h>
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 #endif /* __LINUX_VIDEODEV2_H */