ANDROID: Add dtdiff target for testing am: 7ebab26ea6 am: 725b735feb

Original change: https://android-review.googlesource.com/c/platform/external/dtc/+/2926152

Change-Id: Ie7ac3f4e663b2d1326f2507114a15013eb08837a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>