add bootargs root

hc

2023-02-14 89db217f27d1d16339e417d7db6cfc7341442919

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CCV XPRESS BOARD
M:    Stefan Roese <sr@denx.de>
S:    Maintained
F:    board/ccv/xpress/
F:    include/configs/xpress.h
F:    configs/xpress_defconfig
F:    configs/xpress_spl_defconfig