update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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STOUT BOARD
M:    Cogent Embedded, Inc. <source@cogentembedded.com>
S:    Maintained
F:    board/renesas/stout/
F:    include/configs/stout.h
F:    configs/stout_defconfig