STM32: SYSCFG is remplaced by SBS

Starting from STM32H5, SBS replace SYSCFG IP.
Some register are common (e.g. FPUIMR, FPU interrupt mask register).

Build system and kernel should handle this properly

FYI: https://wiki.st.com/stm32mcu/wiki/Security:Introduction_to_STM32H5_security