RTEMS | bsps/include/dev/spi: Add missing extern and guard (!626)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/626

Project:Branches: opticron/rtems:br6-add-extern-qspi to rtems/rtos/rtems:6
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

bsps/include/dev/spi: Add missing extern and guard

This adds missing extern "C" declarations and a missing header guard.

Updates #5309


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/626
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