mgmt: mcumgr: transport: bluetooth: Fix dynamic registration option

Fixes the Kconfig for dynamic service registration to make it depend
on dynamic database support instead of selecting it, which prevents
issues whereby it is not actually selected

Signed-off-by: Jamie McCrae <spam@helper3000.net>

subsys/mgmt/mcumgr/transport/Kconfig.bluetooth

@@ -93,7 +93,7 @@ endif # MCUMGR_TRASNPORT_BT_CONN_PARAM_CONTROL
 
 config MCUMGR_TRANSPORT_BT_DYNAMIC_SVC_REGISTRATION
 	bool "Register SMP service at runtime"
-	select BT_GATT_DYNAMIC_DB
+	depends on BT_GATT_DYNAMIC_DB
 	default y
 	help
 	  When enabled, the SMP service will be automatically registered at boot time