plat-stm32mp2: add stm32mp25 sysconfig driver

Driver to manage system configuration (sysconf) registers
the sysconf are identified by an ID to be able to be adapted for DT.

Signed-off-by: Arnaud Po

plat-stm32mp2: add stm32mp25 sysconfig driver

Driver to manage system configuration (sysconf) registers
the sysconf are identified by an ID to be able to be adapted for DT.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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