add kernel/.gitignore

hc

2024-08-16 a24a44ff9ca902811b99aa9663d697cf452e08ef

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# Locally calculated
sha256 9b37b661bd3091ceb5d8dc5a56a2dfc02ae9ebc0c63dad3c4289c9d6b3d3ec89  afboot-stm32-0.2.tar.gz