Merge "fastboot: Add a mock transport and some driver tests." am: 2d6c30da...

Merge "fastboot: Add a mock transport and some driver tests." am: 2d6c30da am: 602b94be am: 4ae4d0c6

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2434252



Change-Id: I6189ce666f0934b93f41e7b803188cb105688837
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>