hevcenc: Correctly update second best mv candidate in hme coarse layers Test: poc in the bug report Test: atest CtsMediaV2TestCases:CodecEncoderTest Test: atest VtsHalMediaC2V1_0TargetVideoEncTest Bug: 207502397 Change-Id: I0bc050ca4804b724bc226d6f00f798696d1b5c65 (cherry picked from commit 057f2f3aae4f60765c14deafe38ad75e93e85d34) Merged-In: I0bc050ca4804b724bc226d6f00f798696d1b5c65