replace String.operator== with String.equals

When test HEVC, it should set the mVideoEncoderType as HEVC.
However it will never be set as HEVC due to judge "==" same instance.
The value of mVideoEncoderType is AVC be default even when test HEVC.
Use "equals" to instead of "==".

Bug: 281602940
Test: run cts CtsMediaMiscTestCases

Change-Id: I70937a21c8889ce3c3799f870bc4a9d6162a1416
1 file changed