ASoC: rt5640: Prefix hexadecimal ID register value with 0x in error print

Make it obvious that unexpected value read from ID register is printed in
hexadecimal.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5640.c

@@ -2207,7 +2207,7 @@ static int rt5640_i2c_probe(struct i2c_client *i2c,
 	regmap_read(rt5640->regmap, RT5640_VENDOR_ID2, &val);
 	if (val != RT5640_DEVICE_ID) {
 		dev_err(&i2c->dev,
-			"Device with ID register %x is not rt5640/39\n", val);
+			"Device with ID register %#x is not rt5640/39\n", val);
 		return -ENODEV;
 	}