Remove test cases that have been removed from source code.

`CameraCompatFreeformPolicyTests` and `DisplayRotationCompatPolicyTests` have
been removed from source code, clean up the corresponding test setup.

Fix https://android-build.corp.google.com/test_investigate/invocation/I39700010428139257/test/TR85329833202670510/

Bug: 311643481
Test: N/A
Flag: TEST_ONLY
Change-Id: I77ab52202953e4965ce96310dfabc5f41219012e