Added 46654* to fee-free US short codes.

This change excludes the Google Wallet dedicated short code (being used
    by the Google Wallet team to send notifications to users) from
premium phone numbers. Users may answer the text message free of charge
(e.g. answering HELP). Google internal reference b/25675421.

Change-Id: Ic022ccc19151224b53c8a35c9568e9b943d8220d