Remove unused Android.mk under device/google/felix am: 1890f3cb8b am: be68db3120 am: b1d262f103

Original change: https://android-review.googlesource.com/c/device/google/felix/+/2835912

Change-Id: I34d137678b56c4b6b1404fafc7cce4b482631cc9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>