Merge tag 'android-6.0.0_r26' into HEAD

Android 6.0.0 release 26

* tag 'android-6.0.0_r26':
  Updated prebuilts to ATSL 4.1 release
  Version 4.0 Testing Support Library
  Version 23.0.1 of the support libraries
  Version 23.0.0 of the support libs.

Change-Id: Ic81c8aaf77e81d25f049c3160e465b4e34c29b4b