Upgrade lz4 to v1.9.3 am: 2ce84dba01 am: a57b7caba8 am: 5304b449d3

Original change: https://android-review.googlesource.com/c/platform/external/lz4/+/1824046

Change-Id: I145f40e37b0ad627dacb4bd591d8b847d83c6f56