ARM: mvebu: use arm_coherent_dma_ops and re-enable hardware I/O coherency
Now that we have enabled automatic I/O synchronization barriers, we no longer need any explicit barriers. We can therefore simplify arch/arm/mach-mvebu/coherency.c by using the existing arm_coherent_dma_ops instead of our custom mvebu_hwcc_dma_ops, and re-enable hardware I/O coherency support. Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com> [Andrew Lunn <andrew@lunn.ch>: Remove forgotten comment] Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
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