libhevcenc: Update 32 bit chroma neon modules to avoid reading an extra byte am: fe26571326 am: 4106882997 am: 06372760f5

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libhevc/+/14948939

Change-Id: I9680aae972a5a7ec669c4b1b536adffc5fd15066