DeMar DeRozan is tired of watching the NBA playoffs on TV. More specifically, the first round of the playoffs. Hell, even the second round. He’s sick of being stuck on the sideline for the most important basketball being played every year. And after his fifth straight season without a meaningful playoff series came crashing to a halt Friday night with a 112-91 loss to the Heat in Miami, the frustration was hard to hide. “At the end of the day, I…