USB: qcaux: Add Motorola modem UARTs

On Motorola Mapphone devices such as Droid 4 there are five USB ports that do not use the same layout as Gobi 1K/2K/etc devices listed in qcserial.c. So we should use qcaux.c or option.c as noted by Dan Williams <[email protected]>.

The ff/ff/ff interfaces seem to always be UARTs on Motorola devices. And we should not add interfaces with 0x0a class (CDC Data) as they are part of a multi-interface function like for example interface 0x22b8:0x4281 as noted by Bjørn Mork <[email protected]>.