Merge "Remove unused Android.mk file" into main am: b74e66aa62 am: 2259a20fc4 am: d7eb589e7c

Original change: https://android-review.googlesource.com/c/platform/prebuilts/ndk/+/2854376

Change-Id: I0b79866abefcb06d6329542fc009795678ccfb1d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>