FCC Boss Backs Cingular-ATT Wireless Deal  WASHINGTON (Reuters) - U.S. Federal Communications  Commission Chairman Michael Powell plans to recommend Cingular  Wireless receive approval to purchase AT T Wireless Services  Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AWE.N target=/stocks/quickinfo/fullquote"&gt;AWE.N&lt;/A&gt; with some divestitures, sources familiar with the  matter said on Monday.