ASoC: davinci: Enable menuconfig entry for McASP

In order to be able to use simple-card with McASP on TI SoC based boards we
need to be able to select the McASP via menuconfig.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/davinci/Kconfig

@@ -16,8 +16,14 @@ config SND_DAVINCI_SOC_I2S
 	tristate
 
 config SND_DAVINCI_SOC_MCASP
+	tristate "Multichannel Audio Serial Port (McASP) support"
 	depends on SND_DAVINCI_SOC || SND_OMAP_SOC || SND_EDMA_SOC
-	tristate
+	help
+	  Say Y or M here if you want to have support for McASP IP found in
+	  various Texas Instruments SoCs like:
+	  - daVinci devices
+	  - Sitara line of SoCs (AM335x, AM438x, etc)
+	  - DRA7x devices
 
 config SND_DAVINCI_SOC_VCIF
 	tristate