board: nrf54h20dk: Add missing default BT related configs

There are default configs that are provided by default for
e.g. nRF5340dk to enable HCI IPC communication type for
application domain and enable BT controller for radio domain.
These configs were missing for nRF54h20 DK.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>
diff --git a/boards/nordic/nrf54h20dk/Kconfig.defconfig b/boards/nordic/nrf54h20dk/Kconfig.defconfig
new file mode 100644
index 0000000..74fe939
--- /dev/null
+++ b/boards/nordic/nrf54h20dk/Kconfig.defconfig
@@ -0,0 +1,17 @@
+# Copyright (c) 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_NRF54H20DK_NRF54H20_CPUAPP
+
+choice BT_HCI_BUS_TYPE
+	default BT_HCI_IPC if BT
+endchoice
+
+endif # BOARD_NRF54H20DK_NRF54H20_CPUAPP
+
+if BOARD_NRF54H20DK_NRF54H20_CPURAD
+
+config BT_CTLR
+	default y if BT
+
+endif # BOARD_NRF54H20DK_NRF54H20_CPURAD