Revert "Remove IDataSource dependency from DataSource."

This reverts commit 51467425.

The original change Iaba6d9be is no longer needed since we
separated out DataSourceBase from DataSource. Now, DataSource
may have a method relying on a class from libmedia, IDataSource.

Test: checked the correct wrapping path with 'dumpsys media.extractor'
Bug: 72869975

Change-Id: Ib0d5ca863fa70a4a96f97b3377c209e1f288f443