DO NOT MERGE Decoder: Increased allocation and added checks in sei parsing.

This prevents heap overflow while parsing sei_message.

Bug: 63122634
Test: ran PoC on unpatched/patched
Change-Id: I4785927b68cb17a3ca51e23aeaf96aacacf116d3
Merged-In: I61c1ff4ac053a060be8c24da4671db985cac628c
3 files changed