Switch to libkeyutils.

Bug: http://b/37991155
Test: builds+boots
Change-Id: I33a3ba0d59ffd504093dc94517815c1196e95e2b
diff --git a/KeyUtil.cpp b/KeyUtil.cpp
index fe0f3cb..865cc11 100644
--- a/KeyUtil.cpp
+++ b/KeyUtil.cpp
@@ -20,12 +20,11 @@
 #include <sstream>
 #include <string>
 
-#include <ext4_utils/key_control.h>
-
 #include <openssl/sha.h>
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <keyutils.h>
 
 #include "KeyStorage.h"
 #include "Utils.h"