ARM: multi_v7_defconfig: Enable TLV320AIC3x

A number of TI based platforms use TLV320AIC3x since it was their
standard audio CODEC for quite some time, including the Beagle X15.
Enable it multi_v7_defconfig to improve test coverage.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230731-arm-tlv320aic31xx-config-v1-1-013c8c321dad@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>