Ensure hostside IME tests only use public APIs

With this CL all the APKs used for hostside IME CTS tests can be built
only with public APIs and Test APIs at compile time.

There should be no behavior / requirement change in existing CTS
tests.

Test: make -j cts
Bug: 72399950
Change-Id: I44afda72d321c103a8bb1310fa3bd1d76c3ae8b1
7 files changed