feat(stm32mp2): load fw-config file

Add FW_CONFIG_ID entry in bl2_mem_params_descs to be loaded, and add
its parsing in bl2_plat_handle_post_image_load().

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I151289474325067204ffae62e17c2e1e00f79b1c
2 files changed