Fix license type s/b BY_EXCEPTION_ONLY

The Fraunhofer license has special requirements.

Test: no code change
Change-Id: I439354498c0a28d6ff078cea9a4f8e9bfc02145f
diff --git a/METADATA b/METADATA
index d97975c..5c12860 100644
--- a/METADATA
+++ b/METADATA
@@ -1,3 +1,3 @@
 third_party {
-  license_type: NOTICE
+  license_type: BY_EXCEPTION_ONLY
 }