Merge changes I25465f6d,I55d4b4e3,I0bb11de7,Ibb76bd59,I7bf782fa

* changes:
  vndk-def: Add libvndksupport to LL-NDK
  vndk-def: Update vndk-sp list
  vndk-def: Remove obsolete warning options
  vndk-def: Add `--aosp-system` option
  vndk-def: Remove unused code.