MFD: twl4030-codec -> twl4030-audio: Rename the driver

Rename the driver, and header file from twl4030-codec to
twl4030-audio.
To avoid breakage change depending drivers at the same time.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
CC: Misael Lopez Cruz <misael.lopez@ti.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 98175a0..0002220 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -236,7 +236,7 @@
 	tristate
 
 config SND_SOC_TWL4030
-	select TWL4030_CODEC
+	select MFD_TWL4030_AUDIO
 	tristate
 
 config SND_SOC_TWL6040