NVMe: Allow queues to be allocated above 4GB

Need to call dma_set_coherent_mask() to allow queues to be allocated
above 4GB.
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

drivers/block/nvme.c

@@ -1110,7 +1110,8 @@ static int __devinit nvme_probe(struct pci_dev *pdev,
 	INIT_LIST_HEAD(&dev->namespaces);
 	dev->pci_dev = pdev;
 	pci_set_drvdata(pdev, dev);
-	dma_set_mask(&dev->pci_dev->dev, DMA_BIT_MASK(64));
+	dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+	dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 	nvme_set_instance(dev);
 	dev->entry[0].vector = pdev->irq;