add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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config BR2_TARGET_TS4800_MBRBOOT
    bool "ts4800-mbrboot"
    depends on BR2_ARM_CPU_ARMV7A
    help
      First level bootloader for TS4800 board
 
      https://github.com/embeddedarm/ts4800-mbrboot