luk1337 authored Dec 11, 2018 and Bruno Martins committed Dec 22, 2018

* This prevents inclusion of drivers/staging/greybus/tools/Android.mk
  which will conflict in case we have more than 1 kernel tree in AOSP
  source dir.

Change-Id: I335bca7b6d6463b1ffc673ab5367603347516e13