add bootargs root

hc

2023-02-14 89db217f27d1d16339e417d7db6cfc7341442919

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M54451EVB BOARD
#M:    -
S:    Maintained
F:    board/freescale/m54451evb/
F:    include/configs/M54451EVB.h
F:    configs/M54451EVB_defconfig
F:    configs/M54451EVB_stmicro_defconfig