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/authorization_set_test.cpp b/authorization_set_test.cpp
index 8ba12f5..f59e6d9 100644
--- a/authorization_set_test.cpp
+++ b/authorization_set_test.cpp
@@ -16,9 +16,10 @@
 
 #include <gtest/gtest.h>
 
-#include "authorization_set.h"
+#include <keymaster/authorization_set.h>
+#include <keymaster/google_keymaster_utils.h>
+
 #include "google_keymaster_test_utils.h"
-#include "google_keymaster_utils.h"
 
 int main(int argc, char** argv) {
     ::testing::InitGoogleTest(&argc, argv);