ASoC: cs42l52: fix master playback mute mask.

The mask should define the bits to change in the register, not the
bits to preserve.

This fixes the inadvertent changes of the "Headphone Analog Gain"
value during mute/unmute.
Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Acked-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/cs42l52.h

@@ -157,7 +157,7 @@
 #define CS42L52_PB_CTL1_INV_PCMA		(1 << 2)
 #define CS42L52_PB_CTL1_MSTB_MUTE		(1 << 1)
 #define CS42L52_PB_CTL1_MSTA_MUTE		(1 << 0)
-#define CS42L52_PB_CTL1_MUTE_MASK		0xFFFD
+#define CS42L52_PB_CTL1_MUTE_MASK		0x03
 #define CS42L52_PB_CTL1_MUTE			3
 #define CS42L52_PB_CTL1_UNMUTE			0