Refactor OWNERS files for Android Core Networking

Bug: 120829091
Test: build/make/tools/checkowners.py -c -v path/OWNERS

Change-Id: I1843d9e09731ae10183520f6ded859b9dcccd4b0

OWNERS

+include platform/system/netd:/OWNERS
+
+# TODO: remove this after we make sure first line is working.
+# Add one owner as fail-safe.
 lorenzo@google.com
-ek@google.com
+