samples: bluetooth: switch from hci_ipc to ipc_radio in sample tests

Changed the network core image application from the bluetooth
hci_ipc sample to the ipc_radio application for multicore builds.
The ipc_radio application is commonly used for multicore builds
in other NCS samples and projects. Align with the common practice.

Signed-off-by: Aleksandr Mirlenko <[email protected]>

Author: Mirlenko

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -238,7 +238,15 @@ Amazon Sidewalk samples
 Bluetooth samples
 -----------------
 
-|no_changes_yet_note|
+* Updated the network core image applications for the following samples from the :zephyr:code-sample:`bluetooth_hci_ipc` sample to the :ref:`ipc_radio` application for multicore builds:
+
+  * :ref:`bluetooth_conn_time_synchronization`
+  * :ref:`bluetooth_iso_combined_bis_cis`
+  * :ref:`bluetooth_isochronous_time_synchronization`
+  * :ref:`bt_scanning_while_connecting`
+
+  The :ref:`ipc_radio` application is commonly used for multicore builds in other |NCS| samples and projects.
+  Hence, this is to align with the common practice.
 
 Bluetooth Mesh samples
 ----------------------

samples/bluetooth/conn_time_sync/Kconfig.sysbuild

@@ -6,7 +6,7 @@
 
 source "share/sysbuild/Kconfig"
 
-config NRF_DEFAULT_BLUETOOTH
+config NRF_DEFAULT_IPC_RADIO
 	default y
 
 config NETCORE_IPC_RADIO_BT_HCI_IPC

samples/bluetooth/conn_time_sync/sysbuild/hci_ipc/boards/nrf54h20dk_nrf54h20_cpurad.conf renamed to samples/bluetooth/conn_time_sync/sysbuild/ipc_radio/boards/nrf54h20dk_nrf54h20_cpurad.conf

@@ -6,5 +6,8 @@
 
 source "share/sysbuild/Kconfig"
 
-config NRF_DEFAULT_BLUETOOTH
+config NRF_DEFAULT_IPC_RADIO
+	default y
+
+config NETCORE_IPC_RADIO_BT_HCI_IPC
 	default y

samples/bluetooth/conn_time_sync/sysbuild/hci_ipc/boards/nrf54h20dk_nrf54h20_cpurad.overlay renamed to samples/bluetooth/conn_time_sync/sysbuild/ipc_radio/boards/nrf54h20dk_nrf54h20_cpurad.overlay

@@ -6,7 +6,7 @@
 
 source "share/sysbuild/Kconfig"
 
-config NRF_DEFAULT_BLUETOOTH
+config NRF_DEFAULT_IPC_RADIO
 	default y
 
 config NETCORE_IPC_RADIO_BT_HCI_IPC