drivers: firewall: add stm32_risaf driver

Add the stm32_risaf driver to handle all RISAFs instances on a SoC.
Through RISAF registers, a trusted domain application, or the application
to whom the co

drivers: firewall: add stm32_risaf driver

Add the stm32_risaf driver to handle all RISAFs instances on a SoC.
Through RISAF registers, a trusted domain application, or the application
to whom the configuration has been delegated, assigns memory regions to
one or more security domains (secure, privilege, compartment).
RISAF4 includes the DDR memory cipher engine (DDRMCE) feature.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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