ASoC: fsl_dsp: Rename reserved-region with memory-region

This aligns DSP node description with upstream. No need
to add backward compatibility for older dtbs because
FSL DSP driver is obsolete and it will be removed in the future
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>

sound/soc/fsl/fsl_dsp.c

@@ -897,7 +897,7 @@ static int fsl_dsp_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	reserved_node = of_parse_phandle(np, "reserved-region", 0);
+	reserved_node = of_parse_phandle(np, "memory-region", 0);
 	if (!reserved_node) {
 		dev_err(&pdev->dev, "failed to get reserved region node\n");
 		return -ENODEV;