Remove references to freedombox-setup

Support for building stretch images has already been dropped.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>
2 jobs for master in 6 minutes and 49 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #257358
run-unit-tests

00:03:06

 
  Package
passed #257359
build-debian-package

00:03:42