Updates to wlan hal for mnc-pdk bringup

* Include headers being implictly used
* Fix typecast warning

Change-Id: I525e358c3dceecaf754a0b08cc73fab6de1b65ed
diff --git a/qcwcn/wifi_hal/wificonfig.cpp b/qcwcn/wifi_hal/wificonfig.cpp
index 2504f07..5f30891 100644
--- a/qcwcn/wifi_hal/wificonfig.cpp
+++ b/qcwcn/wifi_hal/wificonfig.cpp
@@ -30,6 +30,7 @@
 #define LOG_TAG  "WifiHAL"
 #include <utils/Log.h>
 #include <time.h>
+#include <errno.h>
 #include "wificonfigcommand.h"
 
 /* Implementation of the API functions exposed in wifi_config.h */