ASoC: adau1373: Replace usage deprecated MUX/ENUM macros

SOC_VALUE_ENUM, SND_SOC_DAPM_VIRT_MUX and SOC_DAPM_ENUM_VIRT are deprecated and
merely an alias for SOC_ENUM, SND_SOC_DAPM_MUX and SOC_DAPM_ENUM. Replace the
deprecated macros so we can eventually remove their definition.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>