By Pete Schroeder WASHINGTON (Reuters) -U.S. stocks tumbled on Friday while the U.S. dollar hit a more than two-year high as investors prepared for a bevy of interest rate hikes in a global inflation fight. All three major Wall Street indices ended down more than 2% a day after Federal Reserve Chairman Jerome Powell indicated that the U.S. central bank was preparing a half-point interest rate hike at its May meeting, with more to come. The Dow Jones Industrial Average closed down 2.82%, while the S&P 500 lost 2.77% and the Nasdaq Composite dropped 2.55%. The MSCI world equity index, which trac…