ASoC: Mediatek: MT8183: Fix fall-through warning for Clang

Fix the following fallthrough warning:

sound/soc/mediatek/mt8183/mt8183-dai-adda.c:342:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]

Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>