feat(st-ddr): add STM32MP2 driver

Add driver to support DDR on STM32MP2 platform. It drives the DDR PHY
and its firmware, as well as the DDR controller.

Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Signed-off-by: Maxime Méré <maxime.mere@foss.st.com>
Change-Id: I93de2db1b9378d5654e76b3bf6f3407d80bc4ca5
diff --git a/plat/st/stm32mp2/plat_ddr.c b/plat/st/stm32mp2/plat_ddr.c
index b665062..5302e45 100644
--- a/plat/st/stm32mp2/plat_ddr.c
+++ b/plat/st/stm32mp2/plat_ddr.c
@@ -9,11 +9,13 @@
 #include <stdint.h>
 
 #include <common/fdt_wrappers.h>
+
 #include <drivers/delay_timer.h>
 #include <drivers/st/regulator.h>
 #include <drivers/st/stm32mp_ddr.h>
 
 #include <libfdt.h>
+
 #include <platform_def.h>
 
 #if STM32MP_DDR3_TYPE