Dependency between userspace and memory protection features

[amergnat]

Describe the bug
On this file: https://github.com/zephyrproject-rtos/zephyr/blob/master/include/app_memory/mem_domain.h#L30
It should be CONFIG_USERSPACE instead of CONFIG_MEMORY_PROTECTION.
This issue force to enable CONFIG_MEMORY_PROTECTION to use userspace feature whereas they shouldn't be dependent (Kconfig and CMakeLists files going this way).

[amergnat]

@nashif Can you assign it to me please, I will add the fix in this PR: #27063

[amergnat]

Linked PR #29811

[amergnat]

Is it possible to have permissions for modifying "linked pull requests", "assignee", "label" of my own PR / issue ?

[github-actions]

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