Add scrypt-based password stretching.

Bug: 27056334
Change-Id: Ifa7f776c21c439f89dad7836175fbd045e1c603e
diff --git a/Android.mk b/Android.mk
index 99a1739..049cd80 100644
--- a/Android.mk
+++ b/Android.mk
@@ -29,6 +29,7 @@
 	TrimTask.cpp \
 	Keymaster.cpp \
 	KeyStorage.cpp \
+	ScryptParameters.cpp \
 	secontext.cpp \
 
 common_c_includes := \