mfd: Add debug trace on entering and leaving arizone runtime suspend

There doesn't appear to be any useful diagnostic information from the
core.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/arizona-core.c

@@ -223,6 +223,8 @@ static int arizona_runtime_resume(struct device *dev)
 	struct arizona *arizona = dev_get_drvdata(dev);
 	int ret;
 
+	dev_dbg(arizona->dev, "Leaving AoD mode\n");
+
 	ret = regulator_enable(arizona->dcvdd);
 	if (ret != 0) {
 		dev_err(arizona->dev, "Failed to enable DCVDD: %d\n", ret);
@@ -246,6 +248,8 @@ static int arizona_runtime_suspend(struct device *dev)
 {
 	struct arizona *arizona = dev_get_drvdata(dev);
 
+	dev_dbg(arizona->dev, "Entering AoD mode\n");
+
 	regulator_disable(arizona->dcvdd);
 	regcache_cache_only(arizona->regmap, true);
 	regcache_mark_dirty(arizona->regmap);