Add DMA-compatible allocators - #6068
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A bit on the lazy side - since cache line sizes are sometimes configurable, this PR just uses the pessimistic upper limit, so it has a bit of wasteage.
Changelog
esp-alloc
DmaCompatibleInternalMemoryandDmaCompatibleExternalMemoryallocators that ensure the returned variable is properly aligned as a DMA buffer.esp-rtos
esp-hal
esp-radio