Indexing in DataUsage was not conventional, since it
blocked adding XML based on current sim status rather than
indexing everything and changing non-indexabe keys.
Manual merge for: ag/2631595
Change-Id: I7bb3cdb0f11772bbaefb6c21c61eb63bd0b17c7e
Fixes: 64193449
Test: robotests
Change-Id: I2d928d1b5313b723450c8f5a45ff944b99dc3d5d
Note: These changes are required for Data balance UI.
Bug: 62349208
Test: make RunSettingsRoboTests -j40