Copy description from Cargo.toml to METADATA

Test: make
Change-Id: I0053ccdbb77730c3370902b11be1fcd5cfdb6237
diff --git a/METADATA b/METADATA
index 2272e9b..904b6a5 100644
--- a/METADATA
+++ b/METADATA
@@ -10,6 +10,7 @@
     value: "https://static.crates.io/crates/libsqlite3-sys/libsqlite3-sys-0.18.0.crate"
   }
   version: "0.18.0"
+  license_type: NOTICE
   last_upgrade_date {
     year: 2020
     month: 6