mei: bus: add me client device list infrastructure

Instead of holding the list of host clients (me_cl)
we want to keep the list me client devices (mei_cl_device)
This way we can create host to me client connection only when needed.
Add list head to mei_cl_device and cl_bus_lock
Add bus_added flag to the me client (mei_me_client) to track if
the appropriate mei_cl_device was already created and is_added
flag to mei_cl_device to track if it was already added to the device
list across the bus rescans

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/bus.c

@@ -657,6 +657,7 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *bus,
 	cldev->dev.bus = &mei_cl_bus_type;
 	cldev->dev.type = &mei_cl_device_type;
 	cldev->bus      = mei_dev_bus_get(bus);
+	INIT_LIST_HEAD(&cldev->bus_list);
 
 	strlcpy(cldev->name, name, sizeof(cldev->name));