Merge changes from topic "st_fip_fconf" into integration

* changes:
feat(plat/st): use FCONF to configure platform
feat(fdts): add STM32MP1 fw-config DT files

feat(fdts): add STM32MP1 fw-config DT files

Create all boards fw-config DT files. They all include a generic
stm32mp15-fw-config.dtsi.

Change-Id: Ib9ac8a59e93e01365001b0d11fee41f7c507c08e
Signed-of

feat(fdts): add STM32MP1 fw-config DT files

Create all boards fw-config DT files. They all include a generic
stm32mp15-fw-config.dtsi.

Change-Id: Ib9ac8a59e93e01365001b0d11fee41f7c507c08e
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>

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