Enable ADB authentication by default.

Change-Id: I942a2df97ef769549b6f76b7c25241380e8df4f1
Merge remote-tracking branch 'upstream/cm-10.1' into cm-10.1
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_vendor_cm into cm-10.1
Merge branch 'cm-10.1' of git://github.com/Team-Hydra/android_vendor_cm into cm-10.1