A new report from BGR claims Apple is preparing to discontinue the iPad mini. When it debuted in 2012 the iPad mini occupied a useful niche between the small iPhone and the much larger iPad, competing with the popular Nexus 7 and Kindle Fire. But with 5.5” iPhones encroaching on the smaller tablet’s main selling point — size — a source now claims Apple is experiencing “fierce cannibalism of our own products” and says the…