add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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BOARDS from CS Systemes d'Information
M:    Christophe Leroy <christophe.leroy@c-s.fr>
S:    Maintained
F:    board/cssi/
F:    include/configs/MCR3000.h
F:    configs/MCR3000_defconfig