update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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default buildroot
 
label buildroot
kernel /boot/zImage
devicetree /boot/imx6dl-riotboard.dtb
append console=ttymxc1,115200 root=/dev/mmcblk1p1 rw