update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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SMARTWEB_HW BOARD
M:    Heiko Schocher <hs@denx.de>
S:    Maintained
F:    board/siemens/smartweb
F:    include/configs/smartweb.h
F:    configs/smartweb_defconfig