samples: Bluetooth: df: Move BLE controller conf into board specific file

Move configuration related with BLE controller into board specific file.
That is required to allow building the sample for nRF5340 where BLE
controller is not part of the sample image.

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

Author: ppryga-nordic

samples/bluetooth/direction_finding_connectionless_tx/boards/nrf52833dk_nrf52833.conf

@@ -0,0 +1,10 @@
+CONFIG_BT_CTLR=y
+CONFIG_BT_LL_SW_SPLIT=y
+
+CONFIG_BT_CTLR_ADV_EXT=y
+CONFIG_BT_CTLR_ADV_PERIODIC=y
+
+# Enable Direction Finding TX Feature including AoA and AoD
+CONFIG_BT_CTLR_DF=y
+CONFIG_BT_CTLR_DF_ANT_SWITCH_RX=n
+CONFIG_BT_CTLR_DF_SCAN_CTE_RX=n