Add license type: Apache2+Clang+MIT = NOTICE

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: no code changes

Change-Id: I41dc6befc8ed72b8795bc5fd0bca9a732f5c72b5
diff --git a/METADATA b/METADATA
index 72458a3..bee7b61 100644
--- a/METADATA
+++ b/METADATA
@@ -17,5 +17,6 @@
     value: "https://github.com/llvm/llvm-project.git"
   }
   version: "161cca266a9d0b6deb5f1fd2de8ad543649a7fa1"
+  license_type: NOTICE
   last_upgrade_date { year: 2019 month: 9 day: 10 }
 }