ASoC: cs42l51: Fix mask for REVID

The REVID mask was changed by commit a1253ef6
"ASoC: cs42l51: split i2c from codec driver". Fix it.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NBrian Austin <brian.austin@cirrus.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

sound/soc/codecs/cs42l51.c

@@ -548,7 +548,8 @@ int cs42l51_probe(struct device *dev, struct regmap *regmap)
 		ret = -ENODEV;
 		goto error;
 	}
-	dev_info(dev, "Cirrus Logic CS42L51, Revision: %02X\n", val & 0xFF);
+	dev_info(dev, "Cirrus Logic CS42L51, Revision: %02X\n",
+		 val & CS42L51_CHIP_REV_MASK);
 
 	ret =  snd_soc_register_codec(dev,
 			&soc_codec_device_cs42l51, &cs42l51_dai, 1);

sound/soc/codecs/cs42l51.h

@@ -26,6 +26,7 @@ int cs42l51_probe(struct device *dev, struct regmap *regmap);
 #define CS42L51_CHIP_ID			0x1B
 #define CS42L51_CHIP_REV_A		0x00
 #define CS42L51_CHIP_REV_B		0x01
+#define CS42L51_CHIP_REV_MASK		0x07
 
 #define CS42L51_CHIP_REV_ID		0x01
 #define CS42L51_MK_CHIP_REV(a, b)	((a)<<3|(b))