ASoC: tlv320adcx140: Add ASI enable for channel 5-8

Add the ALSA controls to enable the ASI for channels 5-8

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200709185129.10505-1-dmurphy@ti.com


Signed-off-by: Mark Brown <broonie@kernel.org>