Fixing microcontroller.cpu on multi-core cpus and adding microcontroller.cpus #4087
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This will allow microcontroller.cpu.temperature, etc. to work properly on an RP2040 or other multi-cpu chip. It will default to the values for cpu 0. In addition, it adds microcontroller.cpus, indexed by cpu number, to allow access to the values for other cpus (for example, microcontroller.cpus[1].voltage) Note that microcontroller.cpus is only added for chips where CIRCUITPY_PROCESSOR_COUNT is defined to be > 1.