external/libgav1: backport obu parser fix | DO NOT MERGE

cl/289910031: obu: Check for size validity in SetTileDataOffset

Bug: b/147231862
Bug: b/147234020
Test: upstream test vectors, repro test case
Change-Id: I440657926b7f763484b120b76579874fb7925dca
(cherry picked from commit fd25597065d1eb70af61ef48dae263acbfca5303)
3 files changed