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

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

Change-Id: I677b3eb4c7750a4aa990c1f9ff455710219f59af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>