ARM: dts: stm32mp1: DT alignment with Linux 5.6-rc1

This commit manages diversity for STM32M15x SOCs with:
- dedicated files to support all STM32MP15 SOCs family.
  The differences between those SOCs are:
  -STM32MP151 [1]: common file.
  -STM32MP153 [2]: STM32MP151 + CANs + a second CortexA7-CPU.
  -STM32MP157 [3]: STM32MP153 + DSI + GPU.
- new files to manage security diversity on STM32MP15x SOCs.
  On STM32MP15xY, "Y" gives information:
  -Y = A means no cryp IP and no secure boot.
  -Y = C means cryp IP + secure boot.
- stm32mp157 pinctrl files to better manage package diversity.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi b/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi
index 347edf7..ed2f024 100644
--- a/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi
@@ -4,7 +4,7 @@
  */
 
 #include <dt-bindings/clock/stm32mp1-clksrc.h>
-#include "stm32mp157-u-boot.dtsi"
+#include "stm32mp15-u-boot.dtsi"
 #include "stm32mp15-ddr3-2x4Gb-1066-binG.dtsi"
 
 / {
@@ -161,7 +161,10 @@
 
 &sdmmc1_b4_pins_a {
 	u-boot,dm-spl;
-	pins {
+	pins1 {
+		u-boot,dm-spl;
+	};
+	pins2 {
 		u-boot,dm-spl;
 	};
 };