wlan: enhance debugging when Tx timeout is detected

Add debug information when tx timeout is detected for
AP mode, and if tx stall perisists issue SSR.
SSR may help is restoring Tx data and will also
help to collect ram-dumps for debugging the issue.

Change-Id: Ie62b127e2fb8ad8fa353cb2dc9c217d331caddad
CRs-Fixed: 685415
diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index caf6f6b..1efdb0b 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -317,6 +317,9 @@
    __u32    rxRefused;
    __u32    pkt_tx_count; //TX pkt Counter used for dynamic splitscan
    __u32    pkt_rx_count; //RX pkt Counter used for dynamic splitscan
+   // tx timeout stats
+   __u32    txTimeoutCount;
+   __u32    continuousTxTimeoutCount;
 } hdd_tx_rx_stats_t;
 
 typedef struct hdd_chip_reset_stats_s