Add the preference controller to control accessibility button opacity preference
cherry picked from commit c497c7aa Bug: 173940869 Test: atest FloatingMenuOpacityPreferenceControllerTest Change-Id: I1fbe3157c93fef4611c3b9b13569c9b339e2898a Merged-In: I1fbe3157c93fef4611c3b9b13569c9b339e2898a
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