Make deprecated AppTarget APIs visible

Some deprecated APIs are still in use and need to stay visible. The SDK
in google3 is 2 weeks behind and will not receive the replacement APIs
until then.

Bug: 130610898
Test: atest AppPredictionServiceTest
Test: Verified that predictions are being loaded in AllApps
Change-Id: Ib6277f9fc46f1fe55a2cec4fc563ecdc964ce8a7