Simplify jetpack test Android.bp by using java_defaults

Bug: N/A
Test: atest AdServicesJetpackTests-1.0.0-beta05
      atest AdServicesJetpackTests-1.1.0-beta01
      atest AdServicesJetpackTests-1.1.0-beta02
      atest AdServicesJetpackTests-1.1.0-beta03
      atest AdServicesJetpackTests-1.1.0-beta04
      atest AdServicesJetpackTests-1.1.0-beta03-S
      atest AdServicesJetpackTests-1.1.0-beta04-S
Change-Id: Ia97f5ea2cc4b7430b6f1a95744169526ea38e379
1 file changed