feat(plat/st): manage io_policies with FCONF

Introduced IO policies management through the trusted
boot firmware config device tree for UUID references.

Change-Id: Ibeeabede51b0514ebba26dbbdae587363b2aa0a7
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
diff --git a/plat/st/stm32mp1/bl2_plat_setup.c b/plat/st/stm32mp1/bl2_plat_setup.c
index 9053a25..e87c529 100644
--- a/plat/st/stm32mp1/bl2_plat_setup.c
+++ b/plat/st/stm32mp1/bl2_plat_setup.c
@@ -330,6 +330,10 @@
 
 	print_reset_reason();
 
+#if !STM32MP_USE_STM32IMAGE
+	fconf_populate("TB_FW", STM32MP_DTB_BASE);
+#endif /* !STM32MP_USE_STM32IMAGE */
+
 	stm32mp_io_setup();
 }