of: address: Follow DMA parent for "dma-coherent"

Much like for address translation, when checking for DMA coherence we
should be sure to walk up the DMA hierarchy, rather than the MMIO one,
now that we can accommodate them being different.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
Tested-by: NNicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: NNicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: NRob Herring <robh@kernel.org>

drivers/of/address.c

@@ -999,7 +999,7 @@ bool of_dma_is_coherent(struct device_node *np)
 			of_node_put(node);
 			return true;
 		}
-		node = of_get_next_parent(node);
+		node = of_get_next_dma_parent(node);
 	}
 	of_node_put(node);
 	return false;