ARM: imx_v6_v7_defconfig: change snd soc tlv320aic3x to i2c variant

Change CONFIG_SND_SOC_TLV320AIC3X to CONFIG_SND_SOC_TLV320AIC3X_I2C.
I did double check all current mainline device trees and they are all
using the I2C rather than the SPI variant.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>