add equals judgement for cts case: android.hardware.camera2.cts.CaptureRequestTest -m testSceneModes
scene-mode (auto) is not single string in some platform, the source is from getCameraCharacteristics
which contains multiple characters. so previous code == is not correct.
Test: make
Test: run android.hardware.camera2.cts.CaptureRequestTest -m testSceneModes
Change-Id: Ie5ffeeebd0d0c237c80768a4a8217bc04e52a173