[chore] Speedup for simple SPI.transfer#2082

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RudolphRiedel wants to merge 2 commits intostm32duino:mainfrom

RudolphRiedel:main

Commits on Jul 22, 2023

- major speedup for simple SPI.transfer(data) and SPI.transfer(buffer, count)
RudolphRiedel
committed

Commits on Jul 24, 2023

- fixed indentation
RudolphRiedel
committed