scripts: Add copyright statements to files without one

Where there isn't a copyright statement, add one to make it explicit.
Also drop editor config lines where they were present and add license
identifiers as MIT if there isn't one.

(From OE-Core rev: deb3ccec53e0bd63bc4235cf2b0d3fc781687361)

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

scripts/oe-time-dd-test.sh

@@ -1,5 +1,9 @@
 #!/bin/bash
 #
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
 # oe-time-dd-test records how much time it takes to 
 # write <count> number of kilobytes to the filesystem.
 # It also records the number of processes that are in