ASoC: meson: aiu: fix acodec dai input name init

Remove the double initialization of the dai input name as reported by
sparse.

Fixes: 65816025 ("ASoC: meson: aiu: add internal dac codec control support")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20200214131350.337968-5-jbrunet@baylibre.com


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