ASoC: tlv320aic31xx: Correct interface register 2 variable name
ASoC: tlv320aic31xx: Correct interface register 2 variable name

Rename iface_reg3 to iface_reg2 since this variable is actually used for
interface register 2.

Signed-off-by: Peter Ujfalusi <e5c0b4cdf99ae1d408b9c497159e74b54e02e008@ti.com>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs