remove dma_supported and pci_dma_supported as public APIs

[Christoph Hellwig]

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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