Add license type: contains MIT is NOTICE license

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: no code changes

Change-Id: Ie6a202e3786fa5547b5620becab9ec04988e3d91
diff --git a/METADATA b/METADATA
index 440c5d9..5d039cb 100644
--- a/METADATA
+++ b/METADATA
@@ -10,6 +10,7 @@
     value: "https://github.com/google/google-api-python-client"
   }
   version: "v1.7.12"
+  license_type: NOTICE
   last_upgrade_date {
     year: 2020
     month: 3