Remove android.test.mock classes from android.jar

This removes all android.test.mock from the main android.jar.

This change is being done now rather than wait until they can all be
removed together because the code base is a moving target. Doing this
change minimizes the window during which other developers could either
revert the previous changes that make this possible or add new code that
relies on the android.test.mock classes being in android.jar and so
would require yet more changes.

Bug: 30188076
Test: make checkbuild
Change-Id: I3d31e4528c99e2e297aaec9c4b657bdd305bd464