stm32mp1: update device tree files

The drivers are also updated to reflect the changes.
Set RCC as non-secure.

Change-Id: I568fa1f418355830ad1d4d1cdcdb910fb362231b
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/fdts/stm32mp15-ddr.dtsi b/fdts/stm32mp15-ddr.dtsi
index be4e2c3..1a5c51c 100644
--- a/fdts/stm32mp15-ddr.dtsi
+++ b/fdts/stm32mp15-ddr.dtsi
@@ -5,7 +5,7 @@
 
 / {
 	soc {
-		ddr: ddr@0x5A003000{
+		ddr: ddr@5A003000{
 
 			compatible = "st,stm32mp1-ddr";