qcacmn: Fix nol timer memory leak

DFS nol timer need cleanup when rmmod driver, otherwise there is
memory leak.

Change-Id: I4f4c91f7fb515133edd4cb852b3760819a390505
CRs-Fixed: 2173788

umac/dfs/core/src/misc/dfs_nol.c

@@ -139,6 +139,7 @@ void dfs_nol_attach(struct wlan_dfs *dfs)
 
 void dfs_nol_detach(struct wlan_dfs *dfs)
 {
+	dfs_nol_timer_cleanup(dfs);
 	qdf_flush_work(&dfs->dfs_nol_elem_free_work);
 	qdf_destroy_work(NULL, &dfs->dfs_nol_elem_free_work);
 	WLAN_DFSNOL_LOCK_DESTROY(dfs);