Reorganize system/keymaster.

This CL moves the includes that should be exported to include/ and
removes the trusty-specific code (some of which is moving to
hardware/google and some of which is moving to the trusty tree.)

Change-Id: Ie4fabf6b5c5f36b50c2f5ff356548ca2e9140fcb
diff --git a/key_blob_test.cpp b/key_blob_test.cpp
index f29fcb6..28de5eb 100644
--- a/key_blob_test.cpp
+++ b/key_blob_test.cpp
@@ -20,9 +20,10 @@
 
 #include <openssl/engine.h>
 
-#include "authorization_set.h"
-#include "google_keymaster_utils.h"
-#include "keymaster_tags.h"
+#include <keymaster/authorization_set.h>
+#include <keymaster/google_keymaster_utils.h>
+#include <keymaster/keymaster_tags.h>
+
 #include "key_blob.h"
 
 int main(int argc, char** argv) {