plat: stm32mp2: make the platform ready to compile with SCP-Fw

STM32MP2 could use SCP-Fw to handle SCMI messages. By default this is
disabled, but it could be enable with these config:
CFG_SCMI_SC

plat: stm32mp2: make the platform ready to compile with SCP-Fw

STM32MP2 could use SCP-Fw to handle SCMI messages. By default this is
disabled, but it could be enable with these config:
CFG_SCMI_SCPFW=y
CFG_SCP_FIRMWARE=<path_to_SCP-Fw_srcs>

On STM32MP2, OP-TEE use the resources describe in the "scmi" device-tree
node to configure SCP-Fw.

Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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