add kernel/.gitignore

hc

2024-08-16 a24a44ff9ca902811b99aa9663d697cf452e08ef

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MX53 CX9020
M:    Patrick Bruenn <p.bruenn@beckhoff.com>
S:    Maintained
F:    board/beckhoff/mx53cx9020/
F:    include/configs/mx53cx9020.h
F:    configs/mx53cx9020_defconfig