[nrf fromtree] dts: riscv: nordic: nrf54h20_cpuflpr: Add stmesp node

Add node with STMESP registers.

Signed-off-by: Krzysztof Chruściński <[email protected]>

Signed-off-by: Sebastian Głąb <[email protected]>
(cherry picked from commit 8e22222)

Author: nordic-segl

dts/riscv/nordic/nrf54h20_cpuflpr.dtsi

@@ -27,6 +27,11 @@ cpusys_vevif: &cpusys_vevif_tx {};
 		compatible = "simple-bus";
 		interrupt-parent = <&cpuflpr_clic>;
 		ranges;
+
+		stmesp: memory@ad000000 {
+			compatible = "arm,stmesp";
+			reg = <0xad000000 0x1000000>;
+		};
 	};
 };