Merge "Fragmentation and reassembly of large messages" into main am: 7aebb9754c am: b9136b91b3

Original change: https://android-review.googlesource.com/c/trusty/app/secretkeeper/+/2921725

Change-Id: Ib875d7f714b2a04a7e089a4df4f2dfdebe8b0dd8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>