Marian Buschsieweke ae79f5fc59
drivers/periph/spi: clean up error codes and doc
- Use negative errno as error codes, rather than home-grown enums
    - Update the home-grown enum with negative errno codes for backward
      compatibility and mark it deprecated
- Update API doc to use negative errno codes
- Fix various style issues in Doxygen doc
    - Use `@retval` to document specific return values instead of abusing
      `@return` for this
    - Align parameters to proper indent level
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