Fix OverlayableInfo native construction

With the removal of the policy field and the regen of the
constructor, the native code is failing.

Fixed and moved it to static initialization, following the same
pattern as the other files, so that it's caught during boot.

Test: manual getOverlayableInfo call at startup boots successfully

Change-Id: I6a04a1b314ad851dd9ecba78e3b52b0564d79df6