Temporary remove resource-display caching

An instance of ResourceKey may correspond to different instances
of Resources at different points in time. This can lead to old
instances of Display returned from cache even if resources have
changed.
We need to ensure 1:1 correspondence between Resources and
ResourceKey before using this kind of cache. Disabling it for now
to fix CTS.

Change-Id: Ib53550c4f2d969c06a570ab6051529269b04b38d
Fixes: 37328072
Fixes: 37305567
Bug: 33430498
Test: android.server.cts.ActivityManagerAppConfigurationTests
Test: android.app.cts.DisplayTest#testRotation