ALSA: ASoC - Fix a typo in Kconfig

The last change to Kconfig ca53fb24
added a wrong item SND_SOC_AC97, which must be SND_SOC_AC97_CODEC.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/codecs/Kconfig

 config SND_SOC_ALL_CODECS
 	tristate "Build all ASoC CODEC drivers"
-	select SND_SOC_AC97 if SND_SOC_AC97_BUS
+	select SND_SOC_AC97_CODEC if SND_SOC_AC97_BUS
 	select SND_SOC_AD1980 if SND_SOC_AC97_BUS
 	select SND_SOC_AD73311 if I2C
 	select SND_SOC_AK4535 if I2C