Laws vary so it's generally never good to say "generally," but generally a single big housing with two separate bulbs/reflectors in it is considered a single headlight. So the Goldwing has two headlights. Not 4. I don't think you're in any trouble.
Further hair splitting is allowed about whether, for example, a fog light or a driving light is a headlight. It is almost mandated by the Lawyer Full Employment Act.
There's a round up of laws here.
http://drivinglaws.aaa.com/tag/motorcycle-equipment/ Unfortunately it doesn't cover the max headlight count, but does hit headlight use. Granted, it's a derivative work so I don't completely trust it without going back to the source docs, which I'm not going to do because I'm perfectly happy running with my lights on all day and night so I don't need to. However, I'll note from a quick scan:
- there are plenty of states with no specific headlight requirement for motorcycles, so they probably only inherit the general motor vehicle requirements to have a headlight at night
- there are plenty of other states that have specific motorcycle requirements for motorcycles, but do not require the headlights to be on during the day (net, you gotta get out more, PastoT
)
- and still plenty more that require you to run the headlight during the day.
Checking Idaho, for example, from what I can see there, a LEO citing an operator for no DRL has wandered off the reservation.
I know there is a federal law that says modulators are legal and cannot be restricted by the states. I can't find a federal law on MC DRLs. Perhaps the manufacturers are reacting to the critical mass of states in the market, rather than a universal requirement.