OOB: generateLocalOobdata()

Implement generation of LE OOB Data

- Remove GD flag to NOP for OobDataReply.
    GD Stack is only up to ACL, so Legacy SM needs to properly function.

Bug: 184377951
Tag: #feature
Test: Manual implementation from p/a/Settings
Change-Id: I6072c70f5e6707eb8f3a6126ffa1edbb5cba5aa4