SE Asia Stocks-Mixed; eyes on U.S. Fed chief speech

March 29 (Reuters) - Southeast Asian stock markets traded mixed on Tuesday as investors turned cautious after sluggish U.S. consumer spending data and moderating inflation in February suggested the Fed may opt for caution on rate increases this year. Monday's report from the U.S. Commerce Department also showed consumer spending in January was not as strong as previously reported. That, together with other data showing a widening in the goods trade deficit in February, indicated economic gr