[nrf fromtree] boards: nrf54h20dk: Add XIP region definition to memory map

Access to this region must be requested through UICR by a local
domain that want to use the Execute In Place (XIP) feature of
the EXMIF peripheral.

Signed-off-by: Andrzej Głąbek <[email protected]>
(cherry picked from commit a2ef8a6)

Author: anangl

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20-memory_map.dtsi

@@ -174,6 +174,15 @@
 			zephyr,memory-region = "DMA_RAM3x_RAD";
 			zephyr,memory-attr = <( DT_MEM_DMA )>;
 		};
+
+		xip_region: memory@60000000 {
+			compatible = "nordic,owned-memory";
+			reg = <0x60000000 0x20000000>;
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0x0 0x60000000 0x20000000>;
+		};
 	};
 };