Adopt ownership of rules_pkg by the Kleaf team

Change-Id: Ie4ea86cf070bdc5bad91f77a8c95b1e9cf858b51
Signed-off-by: Matthias Maennich <maennich@google.com>

OWNERS

diff --git a/OWNERS b/OWNERS
index 2e8f086..926ae1e 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1 +1 @@
-include platform/system/core:main:/janitors/OWNERS
+include kernel/build:/OWNERS