Bluetooth: Controller: Remove experimental from parallel scan+init

The configuration BT_CTLR_SDC_ALLOW_PARALLEL_SCANNING_AND_INITIATING
is no longer experimental.

Because there is now also a corresponding host configuration
(BT_SCAN_AND_INITIATE_IN_PARALLEL), we make the default value
inherit from that one.

A release note entry will be added in a separate commit,
referencing a new sample application using this feature.

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

subsys/bluetooth/controller/Kconfig

@@ -129,10 +129,12 @@ config BT_CTLR_SDC_QOS_CHANNEL_SURVEY
 
 config BT_CTLR_SDC_ALLOW_PARALLEL_SCANNING_AND_INITIATING
 	bool "Allow scanning and initiating at the same time"
-	select EXPERIMENTAL
 	depends on BT_CENTRAL
+	default BT_SCAN_AND_INITIATE_IN_PARALLEL
 	help
-	  Enables support for scanning and initiating at the same time
+	  Enables support for scanning and initiating at the same time.
+	  This feature can be used to reduce the time needed to connect
+	  to many devices.
 
 config BT_CTLR_SDC_PERIPHERAL_COUNT
 	int "Number of concurrent peripheral roles"