Hide touch indicators on mirrored displays if a secure window is present

Utilise ISurfaceComposerClient::eSkipScreenshot to remove the tap
indicators from mirrored displays when a secure window is present.

End-to-end test will be added in an upcoming CL.

Test: manual test & atest PointerChoreographerTest PointerControllerTest
Bug: 325252005

Change-Id: I72a77b1a1b2c02a5e94f05e67d0cd39588086c81