Cleanup vendor projects are proprietary.

Test: m droid dist
Change-Id: I0bdec38c4d12710fa97b91665d211ba6c0d4b24d

libwvdrmengine/oemcrypto/odk/Android.bp

@@ -14,6 +14,7 @@ package {
     // all of the 'license_kinds' from "vendor_widevine_license"
     // to get the below license kinds:
     //   legacy_by_exception_only (by exception only)
+    //   legacy_proprietary (by exception only)
     default_applicable_licenses: ["vendor_widevine_license"],
 }