There were pci_alloc_consistent() failures on ARM64 platform.  Use
dma_alloc_coherent() with GFP_KERNEL flag DMA memory allocations.
Signed-off-by: NMahesh Rajashekhara <mahesh.rajashekhara@microsemi.com>
[hch: tweaked indentation, removed memsets]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NDave Carroll <david.carroll@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>