Update log info.

Bug:256091072

1. Update the method name of log in PMS#updatePowerGroupsLocked().
2. Replace mAmbientLux with mPreThresholdLux because mFastAmbientLux equals to mAmbientLux after ABC#setAmbientLux(mFastAmbientLux).

Signed-off-by: linkai <linkai@xiaomi.com>
Change-Id: I1f871bdc4a9e4f910f16a9c284715bdc341c1ea4
2 files changed