wlan: Driver should serve only one scan request in concurrent scenarios.

Moving scan_info structure from hdd_adapter_t to hdd_context_t to detect
simultaneous scan request on different interfaces.

Change-Id: I355ce5a28017f5c74986a1c4f653119c63aa7ee8
CR-Fixed: 407901
diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index 3b6f97d..bd917c3 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -718,7 +718,6 @@
 #endif
    }sessionCtx;
 
-   hdd_scaninfo_t scan_info;
 #ifdef CONFIG_CFG80211
    hdd_cfg80211_state_t cfg80211State;
 #endif
@@ -906,6 +905,7 @@
    atomic_t isRestartInProgress;
    u_int8_t hdd_restart_retries;
    
+   hdd_scaninfo_t scan_info;
 };