BasePreferenceController: add some nullability annotations
One fixes a NullAway warning reported on change I32ba2b6b8c05c1379b4d921350050979b1866805, and the other is just nice to have. Bug: 245989146 Change-Id: I8a7ffbddf865bab317fdabf5110262bb0626c529 Test: TreeHugger Flag: EXEMPT unable to flag this kind of change
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