mediav2: Restrict OMX encoder tests to use default decoder Some OMX encoders do not work as expected when running in surface mode with s/w decoders. These tests are now limited to default decoder when testing OMX encoders. Bug: 302285865 Bug: 306447777 Test: atest CtsMediaV2TestCases:CodecEncoderSurfaceTest Merged-In: Ida031e328c2229a43134e0448fea064f0e3d82b1 Change-Id: Ida031e328c2229a43134e0448fea064f0e3d82b1