mmap: add test for unaligned len

[badochov]

JIRA: RTOS-923

Description

Motivation and Context

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (refactoring, style fixes, git/CI config, submodule management, no code logic changes)

How Has This Been Tested?

• [ ] Already covered by automatic testing.
• [x] New test added: (add PR link here).
• [ ] Tested by hand on: (list targets here).

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing linter checks and tests passed.
• [ ] My changes generate no new compilation warnings for any of the targets.

Special treatment

• [x] This PR needs additional PRs to work https://github.com/phoenix-rtos/phoenix-rtos-kernel/pull/593
• [ ] I will merge this PR by myself when appropriate.

[badochov]

DEMO: https://github.com/phoenix-rtos/phoenix-rtos-project/pull/1172

[github-actions[bot]]

Unit Test Results

7 724 tests  +24   6 993 :white_check_mark: + 8   38m 12s :stopwatch: - 1m 20s   444 suites + 8     715 :zzz: ± 0      1 files   ± 0      16 :x: +16 

For more details on these failures, see this check.

Results for commit 0c4b7db9. ± Comparison against base commit cf2f8645.

:recycle: This comment has been updated with latest results.