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spi-transfer: Add SPI transfer helper routines

Benjamin Berg requested to merge benzea/spi-transfer-helper into master

These routines assume that any messages is composed of a write and/or read part. While the API allows sending and receiving as part of one messages/transfer, it does not permit full dulex operation where data is both send and received at the same time.

Suggestions for API changes are welcome of course.

Edited by Benjamin Berg

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