ALSA: ASoC - Fix module init entry for twl4030.c

Fixed the function name of module init entry for twl4030.c, which
conflicted with the existing hardware init function:
  sound/soc/codecs/twl4030.c:1278: error: conflicting types for 'twl4030_init'
  sound/soc/codecs/twl4030.c:1187: error: previous definition of 'twl4030_init' was here

Also fixed the section type of init function.

Signed-off-by: Takashi Iwai <tiwai@suse.de>