[PATCH] arm64: dma: Drop cache invalidation from arch_dma_prep_coherent()

[Christoph Hellwig]

On Wed, Aug 24, 2022 at 11:00:02PM +0100, Catalin Marinas wrote:
> (I was wondering why not just invalidate without clean but it could be
> that the allocated memory was zeroed and we want that to make it to the
> PoC)

The memory is zerod after arch_dma_prep_coherent.  So a pure invalidate
seems like the right thing to do here.