[nrf noup] Bluetooth: BT_L2CAP_ECRED is no longer experimental

fixup! [nrf noup] Bluetooth: update experimental for qualification

BT_L2CAP_ECRED is not marked as experimental upstream and we qualify it
downstream.

Signed-off-by: Herman Berget <[email protected]>

Author: hermabe

subsys/bluetooth/host/Kconfig.l2cap

@@ -49,7 +49,6 @@ config BT_L2CAP_DYNAMIC_CHANNEL
 
 config BT_L2CAP_ECRED
 	bool "L2CAP Enhanced Credit Based Flow Control support [EXPERIMENTAL]"
-	select EXPERIMENTAL
 	depends on BT_L2CAP_DYNAMIC_CHANNEL
 	help
 	  This option enables support for LE Connection oriented Channels with