Marking split screen rotate tests as flaky

Adding the flakytest annotation to the tests SplitScreenRotateOneLaunchedAppTest and SplitScreenRotateTwoLaunchedAppTest as seems to crash the device every so often.

Test: atest WMShellFlickerTests
Change-Id: Ie0dcfb60618afbed84b043b1c467a4e74e6cba2e
2 files changed