dt-bindings: add stm32mp25 RISAB bindings

Add stm32mp25 specific RISAB device tree bindings. This file contains
device tree contains helpers and RISABPROT macro that is used to
define the RIF config

dt-bindings: add stm32mp25 RISAB bindings

Add stm32mp25 specific RISAB device tree bindings. This file contains
device tree contains helpers and RISABPROT macro that is used to
define the RIF configuration for a RISAB region.

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

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