Re-land "[shill] Add hardware address to Device objects."

Forgot some headers...

BUG=chromium-os:17744
TEST=unit

This reverts commit 0fda552b0fec3498403336acb9e89dd7799cac74.

Change-Id: I1cd05e47d29bc7ea2a065cabf1d81dd37f74c0f8
Reviewed-on: http://gerrit.chromium.org/gerrit/6270
Reviewed-by: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
diff --git a/cellular.h b/cellular.h
index a273d8a..54f1aaa 100644
--- a/cellular.h
+++ b/cellular.h
@@ -119,6 +119,7 @@
            EventDispatcher *dispatcher,
            Manager *manager,
            const std::string &link_name,
+           const std::string &address,
            int interface_index,
            Type type,
            const std::string &owner,