libvpx: cherry-pick timestamp overflow fixes | DO NOT MERGE

(files affecting the core library only)

* https://chromium-review.googlesource.com/q/Ic6f5eacd9a7c21b95707d31ee2da77dc8ac7dccf
  (11de1b838 Fix timestamp overflow issues)
* https://chromium-review.googlesource.com/q/I1d8a6e263fddb9e4cc6265a313011a18d18bbf9e
  (04383393e Add missing typecast and re-enable timestamp test)

Bug: b/144361434
Test: upstream test coverage, repro test case on coral-userdebug
Change-Id: I094862039d64288ad26b9db35c5dee9bd22083df
5 files changed