bitbake: HEADER: Drop it

We don't really need a header boilerplate now the header is simplified, drop it.

(Bitbake rev: 9b4a9e5459db5f443fcffbdc499e12f09970e709)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/HEADER

@@ -1,5 +0,0 @@
-# <one line to give the program's name and a brief idea of what it does.>
-# Copyright (C) <year>  <name of author>
-#
-# SPDX-License-Identifier: GPL-2.0-only
-#