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

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

Change-Id: I64991b8d0b1262eec66947e637d4b1c98a65545a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>