qcacld-3.0: Add NAPI statistics to dumpstats

Currently NAPI stats are retrieved as a part of iwpriv getStats command.
The buffer available for this command is limited and NAPI stats get
truncated.

Add a new dumpStats parameter (9) to dump NAPI stats.
The following command will dump NAPI Stats into kmsg.
>iwpriv wlan0 dumpStats 9

Cleanup existing getStats

Change-Id: I0d804295d96a495b4afa576c8258f08c9c2b9bbb
CRs-Fixed: 1076563
diff --git a/core/hdd/inc/wlan_hdd_wext.h b/core/hdd/inc/wlan_hdd_wext.h
index 80f1f37..b9b0796 100644
--- a/core/hdd/inc/wlan_hdd_wext.h
+++ b/core/hdd/inc/wlan_hdd_wext.h
@@ -301,6 +301,7 @@
 extern int hdd_unregister_wext(struct net_device *dev);
 extern int hdd_register_wext(struct net_device *dev);
 extern int hdd_wlan_get_freq(uint32_t chan, uint32_t *freq);
+extern void hdd_display_stats_help(void);
 extern void hdd_wlan_get_version(hdd_context_t *hdd_ctx,
 				 union iwreq_data *wrqu, char *extra);