buffet: Add vitalybuka@ into OWNERS

TEST=none
BUG=none

Change-Id: If56a6cb4b948cd50b30ffe251f049aaafd93da3b
Reviewed-on: https://chromium-review.googlesource.com/276341
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>

buffet/OWNERS

diff --git a/buffet/OWNERS b/buffet/OWNERS
index 602359a..6000333 100644
--- a/buffet/OWNERS
+++ b/buffet/OWNERS
@@ -1,4 +1,5 @@
 set noparent
 avakulenko@chromium.org
 sosa@chromium.org
+vitalybuka@chromium.org
 wiley@chromium.org