[CrOS Network] Add azeemarshad@ to //chromeos/network/OWNERS.

Change-Id: Ieb0668d2f451acaa9a3072570cecf84556bdc8c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2012090
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733788}

chromeos/network/OWNERS

+azeemarshad@chromium.org
 khorimoto@chromium.org
 stevenjb@chromium.org
 tbarzic@chromium.org
-# COMPONENT: OS>Systems>Network
+# COMPONENT: UI>Shell>Networking