tests: add an MPU test that circumvents libc #497
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Untested.
Inspired by the recent MPU configuration bug, here is a MPU test that is 'bare metal', i.e. would not be saved by the implicit
sbrkin Tock's libc startup. Note, that this specific test would not actually catch the issue — this currently provides coverage of everything that the app should access without fault. But the goal is to provide complete coverage of the 'good cases' and be easy to modify for specific test cases.