Addressing #12517

- Added GPIO pins to Archim 2
- Added new 108 pin to `fastio_Due.h`

* Remove duplicate calls to PrepareSector

Some flash memory API calls require that a call to `PrepareSector` is done before use. However this call is already made by the LPC1768 framework so the calls in this code are not required.

* Ensure correct alignment of RAM buffer

The LPC176X flash API requires that the RAM buffer used for write operations must be word-aligned. This change ensures that this is the case.

See the PR for full details. The updated system will be documented on the website in the near future.

Fix Z-move to uninitialized position in SWITCHING_EXTRUDERS tool_change (no_move=true)

Access to the DWT peripheral for the `CYCCNT` register needs to happen before `main()`. The code needs to be called after the setup of the system clocks, so the right place is between the `premain()` and `main()` function of the STM32 Arduino core.

This patch moves the DWT access code to a new function, which is then placed between `premain()` and `main()`.