RTEMS | bsps/shared/nandpsu: Invalidate page cache on erase (!1523)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1523

Project:Branches: opticron/rtems:br6-nandpsu-erase-invalidate to rtems/rtos/rtems:6
Author: Kinsey Moore
Assignee: Kinsey Moore

## Summary

bsps/shared/nandpsu: Invalidate page cache on erase

When the opportunistic page cache was added, invalidation was only added
for writes. This could result in bad behavior under certain access
patterns where a read is used to verify an erase. This change ensures
that the page cache is invalidated on block erasure.

Updates #5803


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1523
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