dts: stm32mp157c: add etzpc node

Add a node for the ETZPC device so that driver initializes during
stm32mp15* boot sequence.

Change-Id: I84bf10572e5df7b8f450163c79bcfe6956fc838f
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>

fdts/stm32mp157c.dtsi

@@ -362,5 +362,13 @@
 			#size-cells = <0>;
 			status = "disabled";
 		};
+
+		etzpc: etzpc@5c007000 {
+			compatible = "st,stm32-etzpc";
+			reg = <0x5C007000 0x400>;
+			clocks = <&rcc TZPC>;
+			status = "disabled";
+			secure-status = "okay";
+		};
 	};
 };