Fix a typo introduced by commit e00c3f55
"ASoC: Convert Samsung directory to module_platform_driver".

This fixes the build error:
  CC      sound/soc/samsung/s3c24xx_simtec_tlv320aic23.o
sound/soc/samsung/s3c24xx_simtec_tlv320aic23.c: In function 'simtec_audio_tlv320aic32_driver_init':
sound/soc/samsung/s3c24xx_simtec_tlv320aic23.c:105: error: 'simtec_audio_tlv320aic32_driver' undeclared (first use in this function)
sound/soc/samsung/s3c24xx_simtec_tlv320aic23.c:105: error: (Each undeclared identifier is reported only once
sound/soc/samsung/s3c24xx_simtec_tlv320aic23.c:105: error: for each function it appears in.)
sound/soc/samsung/s3c24xx_simtec_tlv320aic23.c: In function 'simtec_audio_tlv320aic32_driver_exit':
sound/soc/samsung/s3c24xx_simtec_tlv320aic23.c:105: error: 'simtec_audio_tlv320aic32_driver' undeclared (first use in this function)
make[3]: *** [sound/soc/samsung/s3c24xx_simtec_tlv320aic23.o] Error 1
make[2]: *** [sound/soc/samsung] Error 2
make[1]: *** [sound/soc] Error 2
make: *** [sound] Error 2

I think we had better naming it with *driver, thus I change
it to simtec_audio_tlv320aic23_driver.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>