add kernel/.gitignore

hc

2024-08-16 a24a44ff9ca902811b99aa9663d697cf452e08ef

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BR2_riscv=y
BR2_RISCV_ABI_LP64=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_RISCV64_MUSL_BLEEDING_EDGE=y