qcacmn: Include qdf_str.h

The qdf_str APIs have recently been moved from qdf_mem. Reference the
new qdf_str.h header file where appropriate.

Change-Id: If97c9c37a7d720a7b93e50ec228da67a8e980c2e
CRs-Fixed: 2196129

src/os_if_nan.c

@@ -20,8 +20,9 @@
  * DOC: defines nan component os interface APIs
  */
 
-#include "qdf_types.h"
+#include "qdf_str.h"
 #include "qdf_trace.h"
+#include "qdf_types.h"
 #include "os_if_nan.h"
 #include "wlan_nan_api.h"
 #include "nan_ucfg_api.h"