feat(st): add FWU configurations

Test Firmware Update configurations (with PSA_FWU_SUPPORT=1).
Add one FWU config for STM32MP15 on SD-card.
To avoid adding too much configurations, update all STM32MP13 configs
to use FWU and change STM32MP15 boot on raw NAND to use it as well,
as there is some dedicated code for this use case.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I4deb3fe3ca79a45ac7b95c976f44fcd457d4872b
9 files changed