Merge tag 'android-6.0.0_r26' into HEAD

Android 6.0.0 release 26

* tag 'android-6.0.0_r26':
  modify default APN to IPv4v6 according to AT&T Non-virtual apn
  Change APNs as request of operators
  Change APNs as request of operators

Change-Id: I811d2bc64ec3c44db777109fd19827a3315ca459