tests: nrf_auracast: Simplify network core building

Use NRF_DEFAULT_IPC_RADIO to enable building of the hci_ipc
radio sample for the network core instead of adding it manually.

Signed-off-by: Rubin Gerritsen <[email protected]>

Author: rugeGerritsen

tests/bluetooth/bsim/nrf_auraconfig/Kconfig.sysbuild

@@ -6,6 +6,10 @@
 
 source "share/sysbuild/Kconfig"
 
+config NRF_DEFAULT_IPC_RADIO
+	bool
+	default y
+
 config NET_CORE_BOARD
 	string
 	default "nrf5340bsim/nrf5340/cpunet" if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"

tests/bluetooth/bsim/nrf_auraconfig/sysbuild.cmake

@@ -6,10 +6,9 @@
 
 source "share/sysbuild/Kconfig"
 
-config NET_CORE_BOARD
-	string
-	default "nrf5340bsim/nrf5340/cpunet" if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
-
+config NRF_DEFAULT_IPC_RADIO
+	bool
+	default y
 
 config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int