SysUI: Add first time use lock screen hints

This adds a set of hints that will be displayed on the keyguard when
the screen is turned on.  Each of the hints provides the user with
a hint on how to interact with the lock screen.  Once the user has
performed the hinted action the hint should not be shown again.

Change-Id: I438316cbf7a01c3f215330a5ca1aed5b78ab3fdc