openthread: samples: Adjust nrf54h cpuapp partion size.

Commit extends cpuapp partiotion size from 296K to 700K
for nrf54h20 for OT cli sample.

Signed-off-by: Przemyslaw Bida <przemyslaw.bida@nordicsemi.no>

samples/openthread/cli/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+
+/delete-node/ &cpuapp_rx_partitions;
+
+&mram1x {
+
+	cpuapp_rx_partitions: cpuapp-rx-partitions {
+		compatible = "nordic,owned-partitions", "fixed-partitions";
+		status = "disabled";
+		perm-read;
+		perm-execute;
+		perm-secure;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		cpuapp_slot0_partition: partition@a6000 {
+			reg = <0xa6000 DT_SIZE_K(700)>;
+		};
+
+		cpuppr_code_partition: partition@155000 {
+			reg = <0x155000 DT_SIZE_K(64)>;
+		};
+	};
+
+};