PrivacyGuard: add missing @hides to method definitions

Causing DroidDoc compile errors, this fixes it by adding
a @hide to the respective function definitions.

Change-Id: I27675cd6a75fcc1535c812566e5b9098b11335e1
Fix the default value for long press on home.

In AOSP the values for this option are different than in CM.
Switch it back to the CM value for opening recent apps.

Change-Id: I0ded218659f6075aad6f178f3cd614fa10d40488