ARM: omap2plus_defconfig: enable TLV320AIC3X

Commit a96d2ba2 ("ASoC: codecs: tlv320aic3x: move I2C to separated
file") split the driver into SPI and I2C code and also provided a
separate configuration option for it.

The RX51 audio fails to probe since this commit, so let's add this
non-obvious configuration option to the defconfig.

Signed-off-by: Merlijn Wajer <merlijn@wizzup.org>
Message-Id: <20211216150506.31163-1-merlijn@wizzup.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>