ARM: dts: stm32: Manage security diversity for STM32M15x SOCs

This commit creates a new file 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.
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp151.dtsi

@@ -1255,15 +1255,6 @@ dts: thermal@50028000 {
 			status = "disabled";
 		};
 
-		cryp1: cryp@54001000 {
-			compatible = "st,stm32mp1-cryp";
-			reg = <0x54001000 0x400>;
-			interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
-			clocks = <&rcc CRYP1>;
-			resets = <&rcc CRYP1_R>;
-			status = "disabled";
-		};
-
 		hash1: hash@54002000 {
 			compatible = "st,stm32f756-hash";
 			reg = <0x54002000 0x400>;

arch/arm/boot/dts/stm32mp15xc.dtsi

+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright (C) STMicroelectronics 2019 - All Rights Reserved
+ * Author: Alexandre Torgue <alexandre.torgue@st.com> for STMicroelectronics.
+ */
+
+/ {
+	soc {
+		cryp1: cryp@54001000 {
+			compatible = "st,stm32mp1-cryp";
+			reg = <0x54001000 0x400>;
+			interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&rcc CRYP1>;
+			resets = <&rcc CRYP1_R>;
+			status = "disabled";
+		};
+	};
+};