[Roboelectric] Remove backup tests from framework target

This is the sequal to ag/5779092 where we created a new target RunBackupFrameworksServicesRoboTests
spcifically for backup tests. We had then kept the backup tests in the
original target since we want to push out cl/228790879 first to make
sure our new target was being run in presubmit.

Bug: 120223382

Test: 1) atest RunFrameworksServicesRoboTests (backup + location). out: RunFrameworksServicesRoboTests: OK (33 tests)
2) atest RunBackupFrameworksServicesRoboTests (backup). out: RunBackupFrameworksServicesRoboTests: OK (586 tests)

Change-Id: I2016363d95ce2f2ad1b79aa8afc3b44f973f5cfc