dmaengine: ioatdma: Fix variable array length
dmaengine: ioatdma: Fix variable array length

Sparse reported:
drivers/dma/ioat/prep.c:637:27: sparse: Variable length array is used.

Assigning a static value for the array.

Signed-off-by: Dave Jiang <7a72b0ecdf501e4593e842e1a61bf3d5b53699e6@intel.com>
Signed-off-by: Vinod Koul <5cf69c63beb17bf38d63aa0e923ee8256af0e205@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs