Remove retired android_apk[_rel] trybots from PRESUBMIT.py

BUG=webrtc:3741
TBR=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/14289004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7024 4adac7df-926f-26a2-2b94-8c16560cd09d