add kernel/.gitignore

hc

2024-08-16 a24a44ff9ca902811b99aa9663d697cf452e08ef

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label RK3399_ROCK_PI_4 linux
  kernel /Image
  devicetree /rk3399-rock-pi-4.dtb
  append earlycon=uart8250,mmio32,0xff1a0000 root=/dev/mmcblk1p4 rw rootwait