Update ARM Ltd. Copright notices & remove legacy code
Created by: bjackman
The copyright unit test fails due to the glorious arrival of the new year, so update the necessary copyright notices.
I'm just updating ARM Ltd. ones, there are a couple of Google Inc. that still say 2016 (the unit tests allows this). CC @sinkap
Also, while grepping for 2016 I came across some "remove-by" notes, so I'm removing them. https://github.com/ARM-software/trappy/issues/233