libhevcenc: Update 32 bit chroma neon modules to avoid reading an extra byte

When processing V plane, an extra bytes is being read by forward trans
functions. Modules are now updated to avoid that extra byte read

Bug: 177433559
Bug: 183012467

Test: poc in bug
Test: atest CtsMediaTestCases:VideoEncoderTest
Test: atest CtsMediaV2TestCases:CodecEncoderTest
Test: atest VtsHalMediaC2V1_0TargetVideoEncTest
Change-Id: I555458d45719c11081e265824f83918c0126f599