ASoC: tlv320adcx140: Fix mic_bias and vref device tree verification

Fix the range verification check for the mic_bias and vref device tree
entries.

Fixes 37bde5acf040 ("ASoC: tlv320adcx140: Add the tlv320adcx140 codec driver family")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200304193427.16886-1-dmurphy@ti.com


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