KeyguardViewMediatorTest - Flaky test fix

Keep new test changes isolated to the new test to avoid disruption
to the existing tests

Fixes: 196295234
Test: atest KeyguardViewMediatorTest

Change-Id: Ia7706ce8b3923c1bf4fccd3f15edf97c60893472
(cherry picked from commit d4f5bde12fa5d1eccd6d0042b186cda56c621e9b)
1 file changed