rust: Use autogenerated Trusty makefile rules am: 4aec2ba198

Original change: https://android-review.googlesource.com/c/trusty/app/sample/+/2649182

Change-Id: Iba22c865abf4020dc730e24785f12f0a67414490
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>