RTEMS | bsps/arm/stm32u5: Add a new BSP (!515)

[Andrei Chichak (@andreic)]

Andrei Chichak commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/515#note_125821


Yes, this MR is fine with me.
Recently I learned that certain STM32s come with "boot flash". What does that mean? Well, instead of having 4MB of FLASH, like @c-mauderer has with the STM32U5G7, they come with 16k of Flash and the ability to map an external octal/hex SPI flash into the memory map and execute from there.
What @c-mauderer is doing is similar where you have a bootloader in the 4MB boot flash, then execute from octospi, BUT you must not dink with the clocks if you intend to run from octospi.
Push go.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/515#note_125821
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