Co-processor support

[daniel5151]

The ARMv4t ISA can be extended through the use of co-processors connected to the main CPU core.

For example, the EP9302 SoC used in ts7200 includes the MaverickCrunch Math Co-Processor (see section 3 in the EP93xx User's Guide), which adds custom instructions for IEEE floating point, and 64-bit integer math. The EP9202 also uses the co-processor interface to control the onboard MMU, power-states, etc...

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At the moment, armv4t_emu treats all co-processor instructions as noops, simply logging the arguments via log and moving on. It would be better if there was some way to add custom co-processor support to a Cpu.