Photo credit: Pitchfork A few of our favorite hip-hop artists aren’t feelin’ the Grammys this year! Uh-oh… Kendrick Lamar, who’s nominated for a total of eight Grammys, turned down the offer to perform at the event. Drake, who’s up for seven Grammys, and Childish Gambino who’s nominated for ‘Record of the Year’ and ‘Song of…