Add license type: LPL+MIT are NOTICE licenses

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: no code changes

Exempt-From-Owner-Approval: janitorial work

Change-Id: Ib0faff84c40b5354e645a6d314ec26782bcfe5f3
diff --git a/METADATA b/METADATA
index 6abebed..d92b67a 100644
--- a/METADATA
+++ b/METADATA
@@ -11,5 +11,6 @@
     value: "http://google3/third_party/libutf"
   }
   version: "1.1"
+  license_type: NOTICE
   last_upgrade_date { year: 2018 month: 9 day: 19 }
 }