Merge "Replace memalign with posix_memalign" am: 6c83c69703 am: ba5c5cf960 am: b1b03f1c3f

Original change: https://android-review.googlesource.com/c/platform/external/libmpeg2/+/1126409

Change-Id: I3f78f3402c9fd62bc807744959bd8a8ade4f3ed2