ASoC: mediatek: remove unnecessary CONFIG_PM

ASoC: mediatek: remove unnecessary CONFIG_PM

The unnecessary conditional inclusion caused the following warning.

Such as:
>> sound/soc/mediatek/mt8192/mt8192-afe-pcm.c:2368:32: warning: unused
>> variable 'mt8192_afe_pm_ops' [-Wunused-const-variable]
   static const struct dev_pm_ops mt8192_afe_pm_ops = {

Because runtime_pm already handles the case without CONFIG_PM, we
can remove CONFIG_PM condition.

Signed-off-by: Jiaxin Yu <jiaxin.yu@mediatek.com>
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20211125042422.2349-1-jiaxin.yu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>