ASoC: Add PCM3008 ALSA SoC driver

The PCM3008 is a 16-bit stereo audio codec. It accepts
left-justified format for ADC, and right-justified format
for DAC. Independent power-down modes for ADC and DAC are
provided, as well as a digital de-emphasis filter (4 modes).

[Merged Makefile & Kconfig, changed asm/gpio.h to linux/gpio.h -- broonie]

Signed-off-by: Hugo Villeneuve <hugo@hugovil.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 04f49f5..bf68052 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -5,6 +5,7 @@
 	select SND_SOC_AD73311 if I2C
 	select SND_SOC_AK4535 if I2C
 	select SND_SOC_CS4270 if I2C
+	select SND_SOC_PCM3008
 	select SND_SOC_SSM2602 if I2C
 	select SND_SOC_TLV320AIC23 if I2C
 	select SND_SOC_TLV320AIC26 if SPI_MASTER
@@ -70,6 +71,9 @@
 config SND_SOC_L3
        tristate
 
+config SND_SOC_PCM3008
+       tristate
+
 config SND_SOC_SSM2602
 	tristate