Added overlay file to support nRF5340 audio dk + nRF21540
FEM.
Build the hci_ipc with corresponding overlay file to use the
nRF21540 FEM with the bap_broadcast_source sample on nRF5340
audio kit.
Use the below commandline:
$ west build -b nrf5340_audio_dk/nrf5340/cpuapp --sysbuild \
samples/bluetooth/bap_broadcast_source \
-DDTC_OVERLAY_FILE= \
boards/nrf5340_audio_dk_nrf5340_cpuapp_nrf21540_ek.overlay \
-Dhci_ipc_DTC_OVERLAY_FILE= \
boards/nrf5340_audio_dk_nrf5340_cpunet_nrf21540_ek.overlay
Related to commit 35ad653038 ("samples: Bluetooth:
hci_uart/hci_ipc: CI coverage for nRF53+nRF21 FEM").
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
d8cd8ddc51