Removed unneeded call to PreferenceControllerTestUtil.assignPreference()

Bug: 206155448
Bug: 207175350

Test: atest \
  com.android.car.settings.enterprise.AdminGrantedCameraPermissionApplicationListPreferenceControllerTest \
  com.android.car.settings.enterprise.AdminGrantedCameraPermissionPreferenceControllerTest \
  com.android.car.settings.enterprise.AdminGrantedLocationPermissionsApplicationListPreferenceControllerTest \
  com.android.car.settings.enterprise.AdminGrantedLocationPermissionsPreferenceControllerTest \
  com.android.car.settings.enterprise.AdminGrantedMicrophonePermissionApplicationListPreferenceControllerTest \
  com.android.car.settings.enterprise.AdminGrantedMicrophonePermissionPreferenceControllerTest

Change-Id: Ib08751a27a0cabfb50ee3e318660337c37e9e6bb
Merged-In: Ib08751a27a0cabfb50ee3e318660337c37e9e6bb
(cherry picked from commit 737ab9470d7e3f28126ac8cf21766f09ca4af385)
2 files changed