The NBA’s Rookie of the Year sure showed up the league’s Most Valuable Player. Brandon Roy scored a career-high 32 points and added seven assists and the Portland Trail Blazers ended a 13-game losing streak to the Dallas Mavericks with a 91-82 victory Saturday night. LaMarcus Aldridge added 18 points and eight rebounds for the Blazers (3-3), who extended their modest winning streak to three games…