[DO NOT MERGE] context switch with full MPU reconfiguration

[etiaro]

JIRA: RTOS-1149

Description

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• 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.
• 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

• This PR needs additional PRs to work (list the PRs, preferably in merge-order).
• I will merge this PR by myself when appropriate.

[github-actions]

Unit Test Results

    1 files  ±     0    561 suites   - 1 575   50m 13s ⏱️ - 5h 3m 37s
9 462 tests  - 14 963  8 873 ✅  - 11 670  589 💤  - 3 292  0 ❌  - 1 
9 462 runs   - 15 149  8 873 ✅  - 11 817  589 💤  - 3 331  0 ❌  - 1 

Results for commit e8730e6. ± Comparison against base commit 6330e3f.

This pull request removes 14963 tests.

phoenix-rtos-tests/busybox/basename ‑ armv7a7-imx6ull-evk:phoenix-rtos-tests/busybox/basename.basename-does-not-remove-identical-extension
phoenix-rtos-tests/busybox/basename ‑ armv7a7-imx6ull-evk:phoenix-rtos-tests/busybox/basename.basename-works
phoenix-rtos-tests/busybox/basename ‑ armv7a9-zynq7000-qemu:phoenix-rtos-tests/busybox/basename.basename-does-not-remove-identical-extension
phoenix-rtos-tests/busybox/basename ‑ armv7a9-zynq7000-qemu:phoenix-rtos-tests/busybox/basename.basename-works
phoenix-rtos-tests/busybox/basename ‑ armv7a9-zynq7000-zedboard:phoenix-rtos-tests/busybox/basename.basename-does-not-remove-identical-extension
phoenix-rtos-tests/busybox/basename ‑ armv7a9-zynq7000-zedboard:phoenix-rtos-tests/busybox/basename.basename-works
phoenix-rtos-tests/busybox/basename ‑ ia32-generic-qemu:phoenix-rtos-tests/busybox/basename.basename-does-not-remove-identical-extension
phoenix-rtos-tests/busybox/basename ‑ ia32-generic-qemu:phoenix-rtos-tests/busybox/basename.basename-works
phoenix-rtos-tests/busybox/bunzip2 ‑ armv7a7-imx6ull-evk:phoenix-rtos-tests/busybox/bunzip2
phoenix-rtos-tests/busybox/bunzip2 ‑ armv7a9-zynq7000-qemu:phoenix-rtos-tests/busybox/bunzip2
…

♻️ This comment has been updated with latest results.