Added 'Stay unlocked on fold' toogle to display settings. Enabling this
setting will allow user to keep their device awake after the fold the
device.
Test: atest StayAwakeOnFoldPreferenceControllerTest LogicalDisplayMapperTest
Test: manual
Built and flashed foldable device and manually tested by
1. unfolded device -> enable setting -> folded device
2. unfolded device -> disabled setting -> folded devices
Built and flashed non-foldable device and manually tested by
1. Went to Settings -> display -> the toogle setting is not visible
Bug: 274447767
Change-Id: I35fbd0f5d1297ee6e14896e8f3be8301cda6622f
8f4122ad5d