Switch to libkeyutils.

Bug: http://b/37991155
Test: builds+boots
Change-Id: I33a3ba0d59ffd504093dc94517815c1196e95e2b
diff --git a/Android.mk b/Android.mk
index d183a17..17cf843 100644
--- a/Android.mk
+++ b/Android.mk
@@ -44,6 +44,7 @@
 	libsysutils \
 	libbinder \
 	libcutils \
+	libkeyutils \
 	liblog \
 	libdiskconfig \
 	libhardware_legacy \