netdev - remove dma_supported and pci_dma

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Message-Id: <1443885579-7094-1-git-send-email-hch@lst.de>
Date:	Sat,  3 Oct 2015 17:19:24 +0200
From:	Christoph Hellwig <hch@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Don Fry <pcnet32@...ntier.com>,
	Oliver Neukum <oneukum@...e.com>
Cc:	linux-net-drivers@...arflare.com, dri-devel@...ts.freedesktop.org,
	linux-media@...r.kernel.org, netdev@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: remove dma_supported and pci_dma_supported as public APIs

All driver should be using dma_set_mask / pci_set_dma_mask to try
to set the dma mask instead of just querying it.  Without that some
iommu implementations may not work.

pci_dma_supported is removed entirely, but dma_supported stays for
dma_ops implementations for now.

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