Add OWNERS file to ozone/wayland.

Just creating an OWNERS file in the ozone/wayland and adding
myself and Antonio as owners.

Change-Id: I684e74b6ff2c8ec000a2b0f1fe98d6843d9cea46
Reviewed-on: https://chromium-review.googlesource.com/1146931Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#577426}

ui/ozone/platform/wayland/OWNERS

+msisov@igalia.com
+tonikitoo@igalia.com