Cleanup deprecated tools am: 97418f6a8b

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/2181574

Change-Id: I6727438c7cb2f7d2facc633f06c1a11c32cd176f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>