encoder: Use intermediate buffer for accessing last MB row

few SIMD modules read few more bytes from the input buffer
at the end of frame. To avoid OOB read, intermediate buffer
is used while processing last MB row.

Bug: 180505809

Test: poc in bug
Test: atest CtsMediaTestCases:VideoEncoderTest
Test: atest CtsMediaV2TestCases:CodecEncoderTest
Test: atest VtsHalMediaC2V1_0TargetVideoEncTest

Change-Id: I11ca65937c7dfaf623f3535c02158ceec0dcc6ee
1 file changed