update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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Label imx7d-pico-buildroot
  kernel /boot/zImage
  devicetree /boot/imx7d-pico-pi.dtb
  append root=PARTUUID=${uuid} rootwait rw console=${console},${baudrate}