Add OWNERS and DIR_METADATA

These two files are required for each repo, so add them here.

BUG=b:304843634
TEST=CQ

Change-Id: I0769c4885951836d1dbd032fdaf9655f2f674526
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/edk2/+/4935652
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Commit-Queue: Sergey Frolov <sfrolov@google.com>
Auto-Submit: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>