Revert "Revert "Set 24 hour pref. with ACTION_TIME_CHANGED.""

This reverts commit 9ebc27c73e7096159024605a2c4ab1a4b3abbd83.

Change-Id: Id440bd004fee696472aeec9eefa5732755b19627
Merge "Revert "Revert "Set 24 hour pref. with ACTION_TIME_CHANGED."""
Merge remote-tracking branch 'aosp/master'