add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/drivers/mtd/maps/sun_uflash.c
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..
@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* sun_uflash.c - Driver for user-programmable flash on
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  *                Sun Microsystems SME boardsets.
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  *