Get the mainline-presubmit modules from a defaults clause.

All our mainline presubmits have the same list of modules.
Instead of specifying them on each test that uses them, get the
list from a defaults clause to keep them consistent.

Test: treehugger
Change-Id: Ie30d42eab4f1dc4b103d12fb00c54612d100f808
1 file changed