ASoC: tlv320adcx140: Fix GPO register start address

The header was updated to align with the data sheet to start the GPO_CFG
at GPO_CFG0.  The code was not updated to the change and therefore the
GPO_CFG0 register was not written to.

Fixes: 6617cff6 ("ASoC: tlv320adcx140: Add GPO configuration and drive output config")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200730142419.28205-1-dmurphy@ti.com


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