It’s almost time for No. 4 Penn State (5-0) to take on USC (3-2) at the LA Memorial Coliseum. First, though, we have a college football weekend tradition to review: How the ESPN ‘College GameDay’ crew picked one of the marquee matchups of the day, even if the Trojans fell out of the top 25 this week after suffering its second loss of the year last Saturday. “Our job is right now in the moment is to build and prepare each week and try to put out a team that is capable and likely of winning, as much as we possibly can,” Trojans coach Lincoln Riley said this week.“We’ve got our head down, we’re w…