Add license type: BSD is a NOTICE license

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: no code changes
Change-Id: I4c77bd8722eb7ca70f76902e26539ec0e50b1aaa
diff --git a/METADATA b/METADATA
index 37eaaf0..0e91755 100644
--- a/METADATA
+++ b/METADATA
@@ -10,6 +10,7 @@
     value: "https://github.com/gflags/gflags.git"
   }
   version: "v2.2.2"
+  license_type: NOTICE
   last_upgrade_date {
     year: 2019
     month: 2