Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I2664e2ff00ef21ce9971c2081debf6cc41b72a45
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..eb9ff18
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/system/netd:/OWNERS