[nrf noup] boards: nordic: nrf54h20dk: add mpcconf_region node

Because 'ranges' has not yet been added for 'mram1x', the memory
region created by adding zephyr,memory-region to 'mpcconf_partition'
gets the wrong address, relative to MRAM1x, instead of getting an
absolute address. To work around this, add a different
'reserved-memory' node with an absolute address to be used instead.

Signed-off-by: Jonathan Nilsen <jonathan.nilsen@nordicsemi.no>

Author: jonathannilsen

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20-memory_map.dtsi

@@ -114,6 +114,14 @@
 			zephyr,memory-attr = <( DT_MEM_DMA )>;
 		};
 
+		mpcconf_region: memory@e1c2000 {
+			reg = <0xe1c2000 512>;
+		};
+
+		secondary_mpcconf_region: memory@e1c2200 {
+			reg = <0xe1c2200 512>;
+		};
+
 		xip_region: memory@60000000 {
 			compatible = "nordic,owned-memory";
 			reg = <0x60000000 0x20000000>;