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Made good progress on the FPGA - MCU link revamp.

All of system information/health registers (ID code, serial number, fan RPM, temp/voltage monitors, bitstream timestamp, etc) are now readable over QSPI-APB and the legacy-bus interface has been removed.

So far the bridge only works in read mode but I'll be adding write support shortly.

Once I have most of the registers converted over I'll start playing with memory mapping again on the MCU side.