By Scott Rutt Jim Cramer says investors need to think about lightening up on their biggest winners and start raising cash. If there are stocks in your portfolio you’re not happy with, now’s the time to sell, Jim Cramer cautioned his Mad Money viewers Tuesday, after Federal Reserve Gov. Lael Brainard slapped investors with harsh comments that riled the markets. Brainard is widely known as one of the most “dovish” Fed governors, one that favors low interest rates and increased growth. She was one of the loudest voices last year proclaiming that inflation was only transitory and would be headed l…