Motorola asked Apple to pay a potential royalty of 2.25 percent of sales for some iPhones and iPads last year, according to a new report. Citing a letter filed in a California court last month, the Wall Street Journal reports that Motorola had “demanded” the royalty for a license of its patents. According to the report, some consider the royalty—which would have accounted for more than $1 billion based on iPhone sales in 2011 alone—to…