Squashed 'external/trappy/' changes from a8abc5d8b..0b97283a9

0b97283a9 Merge pull request #295 from douglas-raillard-arm/fix_event_ordering
997489975 ftrace: Use full timestamp resolution
350a809e4 ftrace: Ensure timestamp uniqueness

git-subtree-dir: external/trappy
git-subtree-split: 0b97283a99bfd3bc25a8230dbea701f656d3459b