ASoC: Fix SOC_DOUBLE_R_SX_TLV volume mixer arguments

Remove unnecessary bit shifts.
Correct min value to match datasheet.
Num steps = number of steps between min and max.

Reported-by: Ryan Harvey <ryan.harvey@cirrus.com>
Signed-off-by: Ryan Harvey <ryan.harvey@cirrus.com>
Signed-off-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/codecs/cs42l73.c b/sound/soc/codecs/cs42l73.c
index ae37179..8658194 100644
--- a/sound/soc/codecs/cs42l73.c
+++ b/sound/soc/codecs/cs42l73.c
@@ -401,7 +401,7 @@
 			CS42L73_LOBAVOL, 0, 0x41, 0x4B, hpaloa_tlv),
 
 	SOC_DOUBLE_R_SX_TLV("Input PGA Analog Volume", CS42L73_MICAPREPGAAVOL,
-			CS42L73_MICBPREPGABVOL, 5, 0x34,
+			CS42L73_MICBPREPGABVOL, 0, 0x34,
 			0x24, micpga_tlv),
 
 	SOC_DOUBLE_R("MIC Preamp Switch", CS42L73_MICAPREPGAAVOL,