Add SystemUIGoogleKeyguardScreenshotTests to "sysui-screenshot-test" config.

It will be run on git_main CF_phone presubmit. This module is currently stable for this setup: https://android-build.corp.google.com/test_investigate/?invocationId=I17100010212179065&testResultId=TR94229023447853696

Bug: 308478599
Test: presubmit
Flag: None
Change-Id: I1d85a6e72396e8cf63864e7f2c6432aab5425ef4