ICX: dmaengine: ioatdma: add descriptor pre-fetch support for v3.4
commit e0100d40906d5dbe6d09d31083c1a5aaccc947fa upstream. Adding support for new feature on ioatdma 3.4 hardware that provides descriptor pre-fetching in order to reduce small DMA latencies. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NVinod Koul <vkoul@kernel.org> Signed-off-by: NLin Wang <lin.x.wang@intel.com> Signed-off-by: NJeffle Xu <jefflexu@linux.alibaba.com> Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com> Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>
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