PRECIOUS-Gold slips as Treasury yields, dollar firm on higher inflation prospects

* U.S. producer prices rise more than expected in March. * U.S. economy at an "inflection point", says Powell (Updates prices) April 12 (Reuters) - Gold prices fell on Monday, weighed down by firmer U.S. Treasury yields and dollar after better-than-expected U.S. economic data lifted prospects for higher inflation. Spot...