[A11Y] Improve data usage chart TalkBack content
1. Set null content description for all labels of the chart. 2. Set 2 parts in the content description of the chart: I. Brief description of the chart. II. Stats of the data usage. Bug: 141093026 Test: ChartDataUsagePreferenceTest Manually listen to TalkBack speaking Change-Id: I82cefd9987793f40a5bba5bf3ea5f4017da37640
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