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2067: Msp432: Platform fixes r=ppannuto a=lebakassemmerl

### Pull Request Overview

This PR fixes some minor platform-bugs:
* The watchdog was not disabled in the panic-handler which caused the device to reset every time the panic-handler was entered
* With the latest XDS110 debugger-firmware openOCD seems to work fine with 10.000kHz
* The MPU has obviously a minimum alignment of 8K and not 4K. It only worked with 4K by coincidence because the alignment was matched exactly an 8K one.

### Testing Strategy

Testing on eval-board.

### TODO or Help Wanted


### Documentation Updated


### Formatting

- [x] Ran `make ci-nosetup`.

Co-authored-by: hotschi <>

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Tock is an embedded operating system designed for running multiple concurrent, mutually distrustful applications on Cortex-M and RISC-V based embedded platforms. Tock's design centers around protection, both from potentially malicious applications and from device drivers. Tock uses two mechanisms to protect different components of the operating system. First, the kernel and device drivers are written in Rust, a systems programming language that provides compile-time memory safety, type safety and strict aliasing. Tock uses Rust to protect the kernel (e.g. the scheduler and hardware abstraction layer) from platform specific device drivers as well as isolate device drivers from each other. Second, Tock uses memory protection units to isolate applications from each other and the kernel.

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