Fix broken DreamPickerControllerTest

The dream infos are cached at the time the controller is created, so
ensure that we mock out the dream infos before building the controller
instance.

Test: make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.dream.DreamPickerControllerTest"
Bug: 215660413
Change-Id: Ie86f701a46dfc9a0ef185459a1dbf9016c1194fc
1 file changed