fix(stm32mp1): correct include order

Warnings about header files include order were triggered by CI.
Correct the include order to mathc CI requirements.

Change-Id: Iaca959add924e0e1fa2e56fab2348f0ee36e5fa7
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/plat/st/stm32mp1/stm32mp1_private.c b/plat/st/stm32mp1/stm32mp1_private.c
index a8ffecb..50112d0 100644
--- a/plat/st/stm32mp1/stm32mp1_private.c
+++ b/plat/st/stm32mp1/stm32mp1_private.c
@@ -8,9 +8,9 @@
 
 #include <drivers/st/stm32_gpio.h>
 #include <drivers/st/stm32_iwdg.h>
-#include <libfdt.h>
 #include <lib/mmio.h>
 #include <lib/xlat_tables/xlat_tables_v2.h>
+#include <libfdt.h>
 
 #include <platform_def.h>