Fix leakage of unit test on large screen/foldable device

The device type may have additional registrations, so just
clean up them on tearDown.

Fix: 295867194
Fix: 295892211
Test: atest SystemServicesTestRuleTest#testRule_ranSuccessfully
Change-Id: Ie6e841fef7a4754c6a7d700163a2ed23a8df6d5f