Register IPv4 notifier to notify change in IP.

Detect IPv4 address change during suspend state and reconfigure
the ARP filters to the firmware.

Change-Id: I8df10c6ef1d7be81dfd39ace268474bab6b4b353
CRs-Fixed: 587415

Conflicts:
	prima/CORE/HDD/inc/wlan_hdd_power.h
diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index 79149fa..1367813 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -833,6 +833,10 @@
    struct work_struct  ipv6NotifierWorkQueue;
 #endif
     
+   /** IPv4 notifier callback for handling ARP offload on change in IP */
+   struct notifier_block ipv4_notifier;
+   struct work_struct  ipv4NotifierWorkQueue;
+
    //TODO Move this to sta Ctx
    struct wireless_dev wdev ;
    struct cfg80211_scan_request *request ; 
@@ -1315,6 +1319,7 @@
 int wlan_hdd_validate_context(hdd_context_t *pHddCtx);
 v_BOOL_t hdd_is_valid_mac_address(const tANI_U8* pMacAddr);
 VOS_STATUS hdd_issta_p2p_clientconnected(hdd_context_t *pHddCtx);
+void hdd_ipv4_notifier_work_queue(struct work_struct *work);
 #ifdef WLAN_FEATURE_PACKET_FILTERING
 int wlan_hdd_setIPv6Filter(hdd_context_t *pHddCtx, tANI_U8 filterType, tANI_U8 sessionId);
 #endif