[owners] Ensure OWNERS file ends with newline in //

Some OWNERS file ends with a newline character, some don't. As
text editor tends to add newline at the end of text files when
saving, normalize all OWNERS files to end with a newline '\n'.

Bug: none
Change-Id: I994abb0be0802559b2b62e9dd679c076868095e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2905624


Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#886231}