ASoC: cs42l52: Fix mask for REVID

BIT[0:2] of register 01h is REVID, so the mask for REVID should be 0x7.
Also updates the code to use CS42L52_CHIP_REV_MASK.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/codecs/cs42l52.h b/sound/soc/codecs/cs42l52.h
index 6fb8f00..ac445993 100644
--- a/sound/soc/codecs/cs42l52.h
+++ b/sound/soc/codecs/cs42l52.h
@@ -37,7 +37,7 @@
 #define CS42L52_CHIP_REV_A0			0x00
 #define CS42L52_CHIP_REV_A1			0x01
 #define CS42L52_CHIP_REV_B0			0x02
-#define CS42L52_CHIP_REV_MASK			0x03
+#define CS42L52_CHIP_REV_MASK			0x07
 
 #define CS42L52_PWRCTL1				0x02
 #define CS42L52_PWRCTL1_PDN_ALL			0x9F