ASoC: codecs: wcd934x: Set digital gain range correctly

digital gain range is -84dB min to 40dB max, however this was not
correctly specified in the range.

Fix this by with correct range!

Fixes: 1cde8b8 ("ASoC: wcd934x: add basic controls")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20201028154340.17090-1-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Srinivas-Kandagatla

sound/soc/codecs/wcd934x.c

@@ -551,7 +551,7 @@ struct wcd_iir_filter_ctl {
 	struct soc_bytes_ext bytes_ext;
 };
 
-static const DECLARE_TLV_DB_SCALE(digital_gain, 0, 1, 0);
+static const DECLARE_TLV_DB_SCALE(digital_gain, -8400, 100, -8400);
 static const DECLARE_TLV_DB_SCALE(line_gain, 0, 7, 1);
 static const DECLARE_TLV_DB_SCALE(analog_gain, 0, 25, 1);
 static const DECLARE_TLV_DB_SCALE(ear_pa_gain, 0, 150, 0);