Add sources read implicitly when building android.test.mock.stubs.source.test

This CL makes explicit the source files read implicitly when building
android.test.mock.stubs.source.test. The list of source files added was
obtained by using ag/11062343 to dump all implicitly read files during
the execution of a metalava command.

Test: m
out/soong/.intermediates/frameworks/base/test-mock/android.test.mock.stubs.source.test/android_common/check_current_api.timestamp
with RBE_METALAVA=1 to make sure their are no api mismatches when using
the RBE result.

Change-Id: Ib131a13731e0e97cba0c34e19c454d3086858948