MFC r346571,r346572:

Update the spelling of my name

Previous spellings of my name (NGie, Ngie) weren't my legal spelling. Use Enji
instead for clarity.

While here, remove "All Rights Reserved" from copyrights I "own".

MFC r316558:

Use __FBSDID instead of the license agreement to embed the $FreeBSD$ RCS keyword

Reminded by a comment made by markj w.r.t. using __FBSDID in .c files ala a
past Phabricator review.