Use a separate procedd for test activity in DisplayRotationCompatPolicyTests.

Flag enable_camera_compat_track_task_and_app_bugfix queries app processes, so it is important that the process is added to the test map.

This issue has been solved with AppCompatActivityRobot, but this class is not using robot pattern yet.

Flag: EXEMPT test change
Bug: 380840084
Test: atest WmTests:DisplayRotationCompatPolicyTests
Change-Id: I686fa529a24630d96e7169024d63b854f2a381d3