Move update3aregion, validate3aRegion and some StaticMetadata utils to CtsCameraUtils lib. Bug: 199300149 Test: atest CaptureRequestTest.java#testDigitalZoom Merged-In: Ie3c96828b53ef359461eb5845bdedc936eeac209 Change-Id: Ie3c96828b53ef359461eb5845bdedc936eeac209 Signed-off-by: Jayant Chowdhary <jchowdhary@google.com> (cherry picked from commit aabd92ec8ad799a8d095e438d3db45b5282abbef)