Fix tests by adding test activity process to processMap.

Processes with pid=0 are not added to process map. Use a different process, so that camera compat can query them.

Flag: com.android.window.flags.enable_camera_compat_track_task_and_app_bugfix
Test: atest WmTests:CameraCompatFreeformPolicyTests
Test: atest WmTests:DisplayRotationCompatPolicyTests
Fixes: 380840084
Change-Id: Ia223d72dcd7da52274c01f912ebd246a7ea6ff9a