Fix non-determinism in all_teams.pb

this.teams_for_mods uses a dictionary and `range` yields a
non-deterministic ordering. This would cause all_teams.pb to be
non-determinisitic. Since this file is created during Soong analysis, it
would cause the .ninja file to also be non-deterministic.

Use SortedKeys to do the iteration instead.

Test: go build ./android
Test: m nothing a couple of times and checked that the .ninja files are
identical

Change-Id: Ife2d2520d118ef25639f86390912d98b5f057655