ASoC: Zoom2: Add machine driver for Zoom2 board

Add support for Zoom2 board. Zoom2 machine driver
connects both codec DAIs (audio and voice) to omap3
McBSP ports in the following way:

  HiFi <-> McBSP2
 Voice <-> McBSP3

The zoom2 driver has the following DAPM widgets:
* Ext Mic: MAINMIC, SUBMIC (with bias)
* Ext Spk: HFL, HFR
* Headset Stereophone: HSOL, HSOR
* Headset Mic: HSMIC (with bias)
* Aux In: AUXL, AUXR

Signed-off-by: Misael Lopez Cruz <x0052729@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig
index b771238..a5a90e5 100644
--- a/sound/soc/omap/Kconfig
+++ b/sound/soc/omap/Kconfig
@@ -72,4 +72,11 @@
 	help
 	  Say Y if you want to add support for SoC audio on the Beagleboard.
 
+config SND_OMAP_SOC_ZOOM2
+	tristate "SoC Audio support for Zoom2"
+	depends on TWL4030_CORE && SND_OMAP_SOC && MACH_OMAP_ZOOM2
+	select SND_OMAP_SOC_MCBSP
+	select SND_SOC_TWL4030
+	help
+	  Say Y if you want to add support for Soc audio on Zoom2 board.