The buildkey support was removed in 7493ee1c44. This commit removed
PI_BuildKey and most of the usages from the code.
Change-Id: I971d68cd4377c358381983c1edcb98360936b698
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>