add bootargs root

hc

2023-02-14 89db217f27d1d16339e417d7db6cfc7341442919

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platform-$(CONFIG_SOC_EMMA2RH)    += emma/
cflags-$(CONFIG_SOC_EMMA2RH)    +=                    \
        -I$(srctree)/arch/mips/include/asm/mach-emma2rh
load-$(CONFIG_NEC_MARKEINS)    += 0xffffffff88100000