ASoC: tlv320aic23: Remove spurious bits per word setting

regmap should handle any byte ordering issues required, it is looking for
a byte stream from the bus, so don't set 16 bits per word. This is likely
to have tested out OK due to use of an unmerged SPI controller driver.

Signed-off-by: Mark Brown <broonie@linaro.org>
Tested-by: Max Filippov <jcmvbkbc@gmail.com>