add kernel/.gitignore

hc

2024-08-16 a24a44ff9ca902811b99aa9663d697cf452e08ef

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What:        /sys/kernel/dma_heap/total_pools_kb
Date:        Feb 2021
KernelVersion:    5.10
Contact:    Hridya Valsaraju <hridya@google.com>,
Description:
        The total_pools_kb file is read-only and specifies how much
        memory in Kb is allocated to DMA-BUF heap pools.