ASoC: Update Kconfig for Samsung CPUs to reflect S3C64xx support

We now support the 64xx series as well as the 24xx series - make sure
people using Kconfig know this.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/s3c24xx/Kconfig

 config SND_S3C24XX_SOC
-	tristate "SoC Audio for the Samsung S3C24XX chips"
+	tristate "SoC Audio for the Samsung S3CXXXX chips"
 	depends on ARCH_S3C2410 || ARCH_S3C64XX
 	help
 	  Say Y or M if you want to add support for codecs attached to
-	  the S3C24XX AC97, I2S or SSP interface. You will also need
-	  to select the audio interfaces to support below.
+	  the S3C24XX and S3C64XX AC97, I2S or SSP interface. You will
+	  also need to select the audio interfaces to support below.
 
 config SND_S3C24XX_SOC_I2S
 	tristate