update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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THUNDERX BOARD
M:    Sergey Temerkhanov <s.temerkhanov@gmail.com>
S:    Maintained
F:    board/cavium/thunderx/
F:    include/configs/thunderx_88xx.h
F:    configs/thunderx_88xx_defconfig