RTEMS | Restructuring the stm32u5 family directory for multiple BSPs (!1456)

[Chuck McManis (@ChuckMcM)]

Chuck McManis created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1456

Project:Branches: ChuckMcM/rtems:chuckmcm-stm32u5 to rtems/rtos/rtems:main
Author:   Chuck McManis



## Summary

This commit restructures the `./spec/build/bsps/arm/stm32u5` directory to support additional BSPs. It also adds a new BSP, `stm32u5-discovery` which supports the STM32U5 Discovery board at a basic level (console, timers, etc) it does not add any additional drivers. This involves three things, protecting BSP specific code in starthooks based on BSP, restructuring how `linkcmds` is generated in order to be appropriate for the BSP, and pre-selecting console paramters based on the BSP being configured and built to pick the correct USART by default rather than having to specify it in the `config.ini` file when building the BSP. I believe I have preserved all features of the existing BSP (`stm32u5-grisp-nano`) but I do not have one to test so those changes remain untested. I have built and run all of the sample on an STM32 Discovery board and they work as expected.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1456
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