cma: Fix up devicetree bindings

The correct binding for regions is linux,contiguous-regions.
Fix it.

Change-Id: I4bbb4cd3e880c75d917b5a5a081861b3197adfa3
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>

drivers/base/dma-contiguous.c

@@ -195,7 +195,7 @@ int __init cma_fdt_scan(unsigned long node, const char *uname,
 	__be32 *prop;
 
 	if (strncmp(uname, "region@", 7) != 0 || depth != 2 ||
-	    !of_get_flat_dt_prop(node, "contiguous-region", NULL))
+	    !of_get_flat_dt_prop(node, "linux,contiguous-region", NULL))
 		return 0;
 
 	prop = of_get_flat_dt_prop(node, "reg", &len);