dmaengine: k3dma: Off by one in k3_of_dma_simple_xlate()

The d->chans[] array has d->dma_requests elements so the > should be
>= here.

Fixes: 8e6152bc

 ("dmaengine: Add hisilicon k3 DMA engine driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>