Update to repair RPi1, RPi2, and RPi3 boards #1
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Added missing RPi3B revision number as well as detection of 3A+, 3B+, and CM3+. These will be detected as their non-plus versions but should work fine. If there is a reason this doesn't work, adding a new model for 3A+/3B+ and CM3+ would be required. I have no hardware to confirm any of these are correct and function as expected.
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This update will cause the raspberry-sharp-system library to report the correct chip rather than relying on the OS reported processor. Since Raspbian Jessie the CPU has been reported as BCM2835 regardless of actual hardware. As a result, the update in June 2020 was required. However, this update only addressed RPi4 and all other boards would not function. This update extends the same approach to correctly report the CPU.
Note that this update reports the CPU for RPi3 as BCM2709 rather than BCM2710. Since both use the same address for GPIO and the BCM2710 is not included in the raspberry-sharp-io library, this is a slight hack to remain compatible. If that library were updated to include the BCM2710 hardware, the code in this library should be updated.