Remove unused Android.mk am: 1f8ef931c8 am: bf9f19ab69 am: 2d8b561ace

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

Change-Id: I774245ac607d777a2cafe2b1399bcb38fa0c2af8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>