Remove unused Android.mk am: 1f8ef931c8 am: 9069fdb9b0 am: 29c12ecca1

Original change: https://android-review.googlesource.com/c/platform/tools/test/graphicsbenchmark/+/2826052

Change-Id: I908ad495174fb1d1e21ddb48244d0f9e8b2d5733
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>