ASoC: mediatek: remove unnecessary initialization

Cppcheck warning:

sound/soc/mediatek/common/mtk-afe-fe-dai.c:353:8: style: Variable 'i'
is assigned a value that is never used. [unreadVariable]
 int i = 0;
       ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211025185933.144327-6-pierre-louis.bossart@linux.intel.com


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