ASoC: Add MAX9850 codec driver

This patch adds ASoC support for the MAX9850 codec with headphone
amplifier.

Supported features:
- Playback
- 16, 20 and 24 bit audio
- 8k - 48k sample rates
- DAPM

Signed-off-by: Christian Glindkamp <christian.glindkamp@taskit.de>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 10f11dd..d63c175 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -33,6 +33,7 @@
 	select SND_SOC_JZ4740_CODEC if SOC_JZ4740
 	select SND_SOC_LM4857 if I2C
 	select SND_SOC_MAX98088 if I2C
+	select SND_SOC_MAX9850 if I2C
 	select SND_SOC_MAX9877 if I2C
 	select SND_SOC_PCM3008
 	select SND_SOC_SGTL5000 if I2C
@@ -186,6 +187,9 @@
 config SND_SOC_MAX98088
        tristate
 
+config SND_SOC_MAX9850
+	tristate
+
 config SND_SOC_PCM3008
        tristate