ALSA: ASoC: Remove superfluous dependency on SND_SOC

The dependency on SND_SOC is already fulfilled in sound/soc/Kconfig,
thus no more need in Kconfig of each sub directory.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/soc/blackfin/Kconfig

 config SND_BF5XX_I2S
 	tristate "SoC I2S Audio for the ADI BF5xx chip"
-	depends on BLACKFIN && SND_SOC
+	depends on BLACKFIN
 	help
 	  Say Y or M if you want to add support for codecs attached to
 	  the Blackfin SPORT (synchronous serial ports) interface in I2S
@@ -34,7 +34,7 @@ config SND_BFIN_AD73311_SE
 
 config SND_BF5XX_AC97
 	tristate "SoC AC97 Audio for the ADI BF5xx chip"
-	depends on BLACKFIN && SND_SOC
+	depends on BLACKFIN
 	help
 	  Say Y or M if you want to add support for codecs attached to
 	  the Blackfin SPORT (synchronous serial ports) interface in slot 16

sound/soc/fsl/Kconfig

@@ -20,7 +20,7 @@ config SND_SOC_MPC8610_HPCD
 
 config SND_SOC_MPC5200_I2S
 	tristate "Freescale MPC5200 PSC in I2S mode driver"
-	depends on SND_SOC && PPC_MPC52xx && PPC_BESTCOMM
+	depends on PPC_MPC52xx && PPC_BESTCOMM
 	select SND_SOC_OF_SIMPLE
 	select PPC_BESTCOMM_GEN_BD
 	help

sound/soc/omap/Kconfig

 config SND_OMAP_SOC
 	tristate "SoC Audio for the Texas Instruments OMAP chips"
-	depends on ARCH_OMAP && SND_SOC
+	depends on ARCH_OMAP
 
 config SND_OMAP_SOC_MCBSP
 	tristate