Remove unused Android.mk under device/google/felix am: 1890f3cb8b am: 905e71e645

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

Change-Id: I3a39eec5e7136ace54e6cc4f137011ee5678e3ce
Signed-off-by: Automerger Merge Worker <[email protected]>