ASoC: Split s3c2412-i2s.c into core and SoC specific parts

The S3C2412 I2S (IIS) interface is replicated on further Samsung SoC
parts in a broadly compatible way, so split the common code out into
a core called s3c-i2s-v2.[ch] so that the newer SoCs such as the
S3C6410 can make use of it.

As such, all the original s3c2412 functions are currently being left
with their original names, and will be renamed later in the series.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/s3c24xx/Kconfig b/sound/soc/s3c24xx/Kconfig
index 7803218..bd98ada 100644
--- a/sound/soc/s3c24xx/Kconfig
+++ b/sound/soc/s3c24xx/Kconfig
@@ -9,8 +9,12 @@
 config SND_S3C24XX_SOC_I2S
 	tristate
 
+config SND_S3C_I2SV2_SOC
+	tristate
+
 config SND_S3C2412_SOC_I2S
 	tristate
+	select SND_S3C_I2SV2_SOC
 
 config SND_S3C2443_SOC_AC97
 	tristate