add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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SILK BOARD
M:    Cogent Embedded, Inc. <source@cogentembedded.com>
S:    Maintained
F:    board/renesas/silk/
F:    include/configs/silk.h
F:    configs/silk_defconfig