Apple is preparing to bring Siri to the iPad in iOS 6, according to a new report. Citing trusted sources, 9to5Mac reports that Siri on the iPad will offer the full slate of features offered on the iPhone 4S—minus phone call dialing, obviously—and will rely on the iPad’s built-in microphone, which the report claims is fully capable of handling Siri queries accurately. The report goes on to claim that Siri’s interface on the…