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)
4 files changed