[nrf fromtree] tests: arm_thread_swap: Add overlay for nRF54H20

Disable the IPC communication between the domains
for the arm_thread_swap test since it is not needed
and it causes a flash oveflow for the no opmitization
test case.

Signed-off-by: Georgios Vasilakis <[email protected]>
(cherry picked from commit 28bd478)

Author: Vge0rge

tests/arch/arm/arm_thread_swap/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+&cpusec_cpuapp_ipc {
+	status = "disabled";
+};
+
+&cpusec_bellboard {
+	status = "disabled";
+};