netdev - replace PCI_DMA_BUS_IS_PHYS with a per-instance flag

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Date:   Mon,  4 Dec 2017 08:35:58 -0800
From:   Christoph Hellwig <hch@....de>
To:     iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-block@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: replace PCI_DMA_BUS_IS_PHYS with a per-instance flag

Hi all,

this small series tries to get rid of the global and misnamed
PCI_DMA_BUS_IS_PHYS flag, and replace it with a setting in each
struct dma_map_ops instance.