[qca-nss-ecm] Unregister route change events earlier.

It is possible that the route change events are triggered
during the ECM exit operation. So, these event handlers
should be unregistered before freeing the database tables.

Change-Id: I14efa0870a1aaa5f9ea7947a1d8a232223c8e603
Signed-off-by: Murat Sezgin <msezgin@codeaurora.org>
1 file changed