ASoC: mediatek: mt8188: remove unnecessary variable assignment

In the function mt8188_adda_mtkaif_init, 'val' to 0 is repeated,
thus delete one.

Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://patch.msgid.link/20241016011851.2023-1-tangbin@cmss.chinamobile.com


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