Merge "system/security: remove BORINGSSL_201509 support."
am: d8feb9b2ba

* commit 'd8feb9b2ba5ef762cce547620095ceeb75ac261e':
  system/security: remove BORINGSSL_201509 support.
tree: 9a71afdadc8362e1a749710ddda0739de8427c83
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/