ASoC: rt5640: Fix the issue of speaker noise

Remove the class-D internal register setting during initialization
to be compatible with most speaker designs to avoid noise.

Signed-off-by: Derek Fang <derek.fang@realtek.com>
Link: https://lore.kernel.org/r/20230712062553.31066-1-derek.fang@realtek.com


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