[nrf fromlist] boards/nordic/nrf54h20dk: added prototype s2ram_context section

Added DTS node which describes section for PM S2RAM context location

Upstream PR #: 93818

Signed-off-by: Andrzej Puzdrowski <[email protected]>

Author: nvlsianpu

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpuapp.dts

@@ -340,3 +340,20 @@ zephyr_udc0: &usbhs {
 	memory-regions = <&cpuapp_dma_region>;
 	status = "okay";
 };
+
+/* Trim this RAM block for making room on all run-time common S2RAM cpu context. */
+&cpuapp_ram0 {
+	reg = <0x22000000 (DT_SIZE_K(32)-32)>;
+	ranges = <0x0 0x22000000 (0x8000-0x20)>;
+};
+
+/ {
+	soc {
+		/* run-time common S2RAM cpu context RAM */
+		pm_s2ram: cpuapp_s2ram@22007fe0  {
+			compatible = "zephyr,memory-region", "mmio-sram";
+			reg = <0x22007fe0 32>;
+			zephyr,memory-region = "pm_s2ram_context";
+		};
+	};
+};