RTEMS | stm32f4: add stm32f446ze variant and variant specific linker selection (!901)

[Santosh Bala (@santosh.py)]

Santosh Bala commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/901#note_138895


Rebased onto the current target branch.
@joel Please let me know if there are any changes to be addressed in this MR.

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