driver core: rework driver class structures and logic

Removes the device_class, devclass_attribute, and device_interface structures
and replaces them with class, class_device, and class_interface structures.

This allows us to have multiple class_device structures per device structures
which mirrors the ways things really are within the kernel.  It also allows 
class_device structures to be created later than struct devices as they
are naturally created much later in the initialization process of a device.

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