update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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DB_88F6820_GP BOARD
M:    Stefan Roese <sr@denx.de>
S:    Maintained
F:    board/Marvell/db-88f6820-gp/
F:    include/configs/db-88f6820-gp.h
F:    configs/db-88f6820-gp_defconfig