add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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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