Add fwaas_driver.ini to setup.cfg

Change-Id: Ie8157c0df343fb1009e7bc5b3ed2f2d4b0d0afec
Closes-Bug: 1258585
(cherry picked from commit daf0d68f9fc1f878ae29061dc43c19fd3e4950ef)
Merge "Add fwaas_driver.ini to setup.cfg" into stable/havana