Improve consistency of prebuilt android.test.runner with source

Adds android.test.base and android.test.mock to the libs property of
the prebuilt android.test.runner to be consistent with the source
module.

Bug: 148080325
Test: m nothing
      TARGET_BUILD_APPS=Camera2 m

Change-Id: I8ac657ed80989acc80b2df579fa011b3ce70383f
1 file changed