Integrate One-handed mode entry in AOSP Settings.
(Settings > A11y > System controls > One-handed mode)
The entry will show if vendor set below system property
* Property : ro.support_one_handed_mode
Otherwise, the entry will be hidden.
Test: manual check Settings UI
Settings > A11y > System controls > One-handed mode
Bug: 182144396
Change-Id: I699c576a87057274529ca46dee394c413a4cea2b