Revert "Revert "Turn O3 on for the rest of the Cflags""

Becouse AJ is a whore... see link for details

https://github.com/TEAM-Gummy/android_frameworks_base/commit/ad6f3364a3e370b32cb7e265b89037b7e641f142

This reverts commit c55517d7cdb74e34bfe7d49d84ada4488c9a0239.