No one makes a 12V light receptacle with a charging port?

There are several versions of what you want.. I can describe them but there are just too many to provide links to them.

Some are wall plates, like your regular switch cover size plates, some have only USB 5 volt outlets some also have a 12 volt accessory outlet

Some are surface mount

Some are single hole mount (liek a 12 volt accessory outlets)

and of course I have one that plugs into a standard 12 volt accessory outlet has 2 of those as well as 2 USB ports at the other end of the cord.

http://www.amazon.com/Charger-Socket-Outlet-Panel-Marine/dp/B00I3Q2YC0

http://store.valueaccessories.net/CobraChargingSystem12VoltPowerOutletandUSB.aspx

http://www.campingworld.com/shopping/item/usb-12-volt-charger-ivory/67522

To give you an idea of some of what is out there, This is far, far from a complete list.