separate hinge angle feature into another file This will remove the confusion of app that uses hinge_angle sensor to detect foldable device. For foldable, it will provide an extra_feature.xml file in the data/system partition to enable hinge_angle sensor. Ignore-AOSP-First: still preview Bug: 296162661 Change-Id: Ib0b5a974a5a1a2c69d8de23771f9c393a4a18d4c Merged-In: Ib0b5a974a5a1a2c69d8de23771f9c393a4a18d4c (cherry picked from commit fd155df997d8a08ceed586f082ace9a2ba489bb5)