licensing: Add exemption for fuji-xerox printing package

The fuji-xerox-printing-license package is empty as we only
need to to include the license in credits.  The PPDs that the
license covers are served independently of the chromeOS version.

BUG=chromium:1069549
TEST=./run_tests

Change-Id: Ibdb1762e52d39b0ab62aaf05a01d8480b4a6dfad
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2382457
Tested-by: Sean Kau <skau@chromium.org>
Auto-Submit: Sean Kau <skau@chromium.org>
Reviewed-by: George Engelbrecht <engeg@google.com>
Commit-Queue: Sean Kau <skau@chromium.org>
diff --git a/licensing/licenses_lib.py b/licensing/licenses_lib.py
index 934083c..27eba80 100644
--- a/licensing/licenses_lib.py
+++ b/licensing/licenses_lib.py
@@ -181,6 +181,7 @@
 # The full names of packages which we want to generate license information for
 # even though they have an empty installation size.
 SIZE_EXEMPT_PACKAGES = [
+    'net-print/fuji-xerox-printing-license',
     'net-print/konica-minolta-printing-license',
     'net-print/xerox-printing-license',
 ]