Merge "Remove unused Android.mk file" into main am: b74e66aa62 am: 4306e0b6af am: a888409c06

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

Change-Id: I851a7ca94549f82bdaba8f7950d8d4be36b70c9f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>