Bluetooth: Controller: Make some DF configs specific to BT_LL_SPLIT

These configurations are tighlty coupled to the implementation,
so these should be hidden when not using BT_LL_SW_SPLIT.

Signed-off-by: Rubin Gerritsen <rubin.gerritsen@nordicsemi.no>
diff --git a/subsys/bluetooth/controller/Kconfig.df b/subsys/bluetooth/controller/Kconfig.df
index 9a7969c..6a6ac9d 100644
--- a/subsys/bluetooth/controller/Kconfig.df
+++ b/subsys/bluetooth/controller/Kconfig.df
@@ -145,6 +145,8 @@
 	  Enable reception and sampling of Constant Tone Extension in direction
 	  finding connected mode.
 
+if BT_LL_SW_SPLIT
+
 config BT_CTLR_DF_SAMPLE_CTE_FOR_PDU_WITH_BAD_CRC
 	bool "Sampling of CTE for PDUs with bad CRC"
 	depends on BT_CTLR_DF_SCAN_CTE_RX
@@ -269,4 +271,6 @@
 	  enables workaround for the delay to maintain inter frame spacing (IFS) for connection
 	  events.
 
+endif # BT_LL_SW_SPLIT
+
 endif # BT_CTLR_DF