applications: ipc_radio: enable lfclk for nrf54h20 cpurad

Clocks are now disabled by default on the nrf54h20. Enable the lfclk
as it is required by MPSL.

Signed-off-by: Bjarki Arge Andreasen <[email protected]>

Author: bjarki-andreasen

applications/ipc_radio/boards/nrf54h20dk_nrf54h20_cpurad.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+&lfclk {
+	status = "okay";
+};