Advanced Micro Devices Inc (NASDAQ: AMD) and Eaton Corporation PLC (NYSE: ETN) are unfairly down following their earnings and, therefore, should be bought on the recent weakness, says famed investor Jim Cramer. He loaded up on 75 shares of AMD and 25 shares of Eaton following the opening bell on Tuesday. His Charitable Trust now owns 425 shares of the chipmaker and 300 shares of the power management company in total. Both AMD and ETN reported solid quarterly results and issued upbeat future guidance last week. Still, both stocks have lost about 7.0% in recent days. Why is Cramer bullish on AMD…