xtensa: mpu: adding or removing partitions from memory domain of current running thread has no effect

[dcpleung]

Describe the bug
Adding or removing partitions from the memory domain of the currently running thread has no effect. The memory regions cannot be access (for additions), or can still be accessed (for removal) after calling k_mem_domain_add_partition() or k_mem_domain_remove_partition().

Expected behavior

• Memory of newly added partition can be accessed.
• Memory of recently removed partition cannot be accessed.

Impact
Annoyance ... for now.

Environment (please complete the following information):

• Commit 5feb028

[github-actions]

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[dcpleung]

Reopen to reuse this for backport