ASoC: Add WM8915 CODEC driver

The WM8915 is an ultra low power mobile CODEC designed for smartphones,
featuring a mixture of digital and analogue I/O with flexible mixing
options and advanced low power accessory detection functionality in a
compact package.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index ee7374e..54d5dd6 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -73,6 +73,7 @@
 	select SND_SOC_WM8900 if I2C
 	select SND_SOC_WM8903 if I2C
 	select SND_SOC_WM8904 if I2C
+	select SND_SOC_WM8915 if I2C
 	select SND_SOC_WM8940 if I2C
 	select SND_SOC_WM8955 if I2C
 	select SND_SOC_WM8960 if I2C
@@ -302,6 +303,9 @@
 config SND_SOC_WM8904
 	tristate
 
+config SND_SOC_WM8915
+	tristate
+
 config SND_SOC_WM8940
         tristate