add kernel/.gitignore

hc

2024-08-16 a24a44ff9ca902811b99aa9663d697cf452e08ef

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label rock64-buildroot
  kernel /boot/Image
  devicetree /boot/rk3328-rock64.dtb
  append console=ttyS2,1500000n8 root=/dev/mmcblk0p1 ro rootwait