Reduce logging of flattened Preferences

Bug: 11901390

Change-Id: I9f2e27e769fd745be01bb2c12a7f07b45aa0b905
Merge tag 'android-4.4.2_r1' into HEAD

Android 4.4.2 Release 1
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0