Add tiebreak rules for bar chart permissions.

If multiple permissions have been used by the same number of apps, we
apply a stable tiebreak so we can be consistent in different places.
We prefer location, then microphone, then camera, and everything else
is alphabetical.

Test: View chart with ties.
Test: atest PermissionBarChartPreferenceControllerTest
Change-Id: I035ac19391788cc720e1c832bf8bd5a60d31e8ad