I think when people talk about "dual core" etc. they're really thinking in terms of SMP.

Most SoCs today have a single ARM core with additional hardware units to help with certain types of workload, but that doesn't make these SoCs "multi-core" in the same way that a SoC with two or more SMP-enabled general purpose ARM cores would be considered a "true" dual-core device etc.

Also the Android-based G1 had two cores on it's Qualcomm SoC - an ARM9 running a closed source real-time OS for the GSM stack (ie. phone functions) and a completely separate ARM11 for the Android OS and applications. The same SoC also had two DSPs plus media and video hardware acceleration units. Still wasn't "dual-core" though, as it had no SMP capability whatsoever.