add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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/*
 * Copyright (C) 2015, Google, Inc
 *
 * SPDX-License-Identifier:    GPL-2.0+
 */
 
.globl early_board_init
early_board_init:
    jmp    early_board_init_ret