wpa_ctrl missing include for sys/stat.h

wpa_ctrl.c gets sys/stat.h inherited from
private/android_filesystem_config.h it should
not rely on this in the future. The intent is
to move fs_config function into libcutils and
thus deprecate any need for sys/stat.h in this
include file.

Bug: 19908228
Change-Id: I83a682a0bebd3e1a50cf4a6e42fa37b194a95bc0
diff --git a/src/common/wpa_ctrl.c b/src/common/wpa_ctrl.c
index 5820a13..d0d0853 100644
--- a/src/common/wpa_ctrl.c
+++ b/src/common/wpa_ctrl.c
@@ -21,6 +21,7 @@
 
 #ifdef ANDROID
 #include <dirent.h>
+#include <sys/stat.h>
 #include <cutils/sockets.h>
 #include "private/android_filesystem_config.h"
 #endif /* ANDROID */