dmaengine: cppi41: Fix an Oops happening in cppi41_dma_probe()

This fix an Oops happening on all platforms using the old dt bindings
(all platforms but da8xx).
This update cppi41_dma_probe() to use the index variable which is
required to keep compatibility between old and new dt bindings.

Fixes: 8e3ba95f4190 ("dmaengine: cppi41: use managed functions devm_*()")
Reported-by: Tony Lindgren <[e-mail]>
Signed-off-by: Alexandre Bailon <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/cppi41.c

···
 	if (index < 0)
 		return index;
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, index);
 	cdd->ctrl_mem = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(cdd->ctrl_mem))
 		return PTR_ERR(cdd->ctrl_mem);
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, index + 1);
 	cdd->sched_mem = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(cdd->sched_mem))
 		return PTR_ERR(cdd->sched_mem);
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, index + 2);
 	cdd->qmgr_mem = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(cdd->qmgr_mem))
 		return PTR_ERR(cdd->qmgr_mem);