non-DMA SPI working; adding this now for testing; will continue with DMA #443
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Tested with BMP280 SPI on '21 and '51
needs corresponding ASF4 PR as well
Also, fixed pin mappings for rev B Metro M4:
swap PA12 and PA13 on SPI 2x3 header
swap A3 and A5
Comment out all frozen modules in CPX again to make room while waiting
for SPI flash.