cnss2: call remove driver_ops in cnss_wlan_unregister

rmmod of wlan triggers cnss_wlan_unregister. wlan driver_ops
remove should be called for QCN7605 standalone and
composite devices to finish the rmmod path.

Change-Id: I0047eb65b68b7e81b9b9c9fd79825a0d3f27c640
Signed-off-by: Rajasekaran Kalidoss <rkalidos@codeaurora.org>