[nrf noup] Bluetoooth: host: Update experimental for qualification

Update Kconfig options for qualification:
 - Remove experimental on qualified feature.
 - Add experimental on unqualified feature.

Signed-off-by: Joakim Andersson <[email protected]>

Author: joerchan

subsys/bluetooth/Kconfig

@@ -107,7 +107,7 @@ config BT_BROADCASTER
 endmenu
 
 config BT_EXT_ADV
-	bool "Extended Advertising and Scanning support [EXPERIMENTAL]"
+	bool "Extended Advertising and Scanning support"
 	help
 	  Select this to enable Extended Advertising API support.
 	  This enables support for advertising with multiple advertising sets,

subsys/bluetooth/host/Kconfig.l2cap

@@ -57,7 +57,7 @@ config BT_L2CAP_DYNAMIC_CHANNEL
 	  allowing the creation of dynamic L2CAP Channels.
 
 config BT_L2CAP_ECRED
-	bool "L2CAP Enhanced Credit Based Flow Control support"
+	bool "L2CAP Enhanced Credit Based Flow Control support [EXPERIMENTAL]"
 	depends on BT_L2CAP_DYNAMIC_CHANNEL
 	help
 	  This option enables support for LE Connection oriented Channels with