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bus_dma(9): Correct arm64 BUS_DMA_COHERENT implementation note

Description

bus_dma(9): Correct arm64 BUS_DMA_COHERENT implementation note

BUS_DMA_COHERENT isn't supported in bus_dmamap_create but bus_dma_tag_create.
Document it properly.

Submitted by: andrew

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manuAuthored on
Parents
rS334040: Fix double-load of %cr3 and double-copy of the stack frame for the
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