Set YCbCr420_888 as default camera format

Bug: b/189957071

Test: run cts -m CtsCameraTestCases -t
android.hardware.camera2.cts.RobustnessTest#testAbandonRepeatingRequestSurface[1]

Change-Id: Ib1fb929fe2d37a5b187a294b853af18ca2b7eb60
2 files changed