Fix DataUsageSummary non-indexable keys

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