update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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