Camera: Return sequence id for advanced extension requests

Allow 'IRequestProcessorImpl' to return the camera sequence id
in response to capture requests.

Bug: 196090349
Test: atest -c
cts/tests/camera/src/android/hardware/camera2/cts/CameraExtensionSessionTest.java

Change-Id: I3d67e4ba1b4503cf71c31751920e916d014ef3ab