Apple may have sold 78 million or more iOS devices during the December quarter, according to estimates from Canaccord Genuity analyst Michael Walkley. He argues that sales of the iPhone 5s and iPad Air — Apple’s flagship products — were “strong” during the holidays, and is projecting a split of 54 million iPhones and 24.8 million iPads. Those numbers would represent year-over-year increases of 13 and 8 percent, respectively. iPod touch sales could boost iOS numbers further, but Walkley isn’t including the player in his figures….