Merge "backport vp8/9 unsigned int overflow fix" am: c03eb8c06c am: 97913d2610 am: 07992cce10 am: e9f97ec3c3 am: 1220796c92 am: 8ccbb81963

Original change: https://android-review.googlesource.com/c/platform/external/libvpx/+/1700605

Change-Id: I1da1598369f86b2671cb1dc626af4688f9a97961