samples: basic: empty: Disable uart

Disable UART in nrf54h20 cpurad to reduce power consumption.

Signed-off-by: Piotr Krzyzanowski <[email protected]>

Author: nordic-pikr

samples/basic/empty/boards/nrf54h20dk_nrf54h20_cpurad.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+&uart135 {
+	status = "disabled";
+};