add nkmcu

hc

2023-11-06 170c1c0fa90ad9f762d1877f8a57efce706fc95a

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LITEBOARD
M:    Marcin Niestroj <m.niestroj@grinn-global.com>
S:    Maintained
F:    board/grinn/liteboard/
F:    include/configs/liteboard.h
F:    configs/liteboard_defconfig