Read content provider if available for BL

Use Content provider if available to get the business logic
files.

Test: ./gts-tradefed run gts -m GtsPlacementTestCases --include-filter "GtsPlacemens com.google.android.placement.gts.UiPlacementTest"
Bug: 121325876
Change-Id: I0107c6916d83ebda8adf9b12148da439986ee2df
Merged-In: If1d13f61e6ca1d09132e250a009a423af654f282
2 files changed