Merge tag 'android-5.1.0_r1' into HEAD

Android 5.1.0 release 1
tree: 1037f8ac91562a5509d6dfdd6e2cfb1251342aaf
  1. include/
  2. libril/
  3. librilutils/
  4. reference-ril/
  5. rild/
  6. Android.mk
  7. CleanSpec.mk