Add STEP-MXO2 board support. #253
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Diamond is the default for now; Trellis works in principle. But to make the Trellis flow turnkey requires YosysHQ/prjtrellis#233 to be merged (even in it's current minimal state it should be enough).
There are two variants of this board I'm aware of, but they differ only in how they are programmed, not in peripherals or FPGA; I target the LPC variant, which has a built-in STM32 bootloader that only accepts (a subset of valid) JED files.
All peripherals were tested (and I also tested one GPIO pin).