ASoC: Reenable S3C64xx I2S support

Joonyoung Shim reports that S3C64xx I2S is working on the NCP boards so
allow it to be selected in Kconfig.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmciro.com>

sound/soc/s3c24xx/Kconfig

 config SND_S3C24XX_SOC
 	tristate "SoC Audio for the Samsung S3CXXXX chips"
-	depends on ARCH_S3C2410
+	depends on ARCH_S3C2410 || ARCH_S3C64XX
 	help
 	  Say Y or M if you want to add support for codecs attached to
 	  the S3C24XX AC97 or I2S interfaces. You will also need to