cros_choose_profile: remove dead code

We don't use the primary overlay, lets not compute it.

BUG=None
TEST=trybot run on chromiumos-sdk, daisy, lumpy, link, daisy_spring,
  gizmo.

Change-Id: Ibdd9cce89fd737766c70df659f63353e03255c40
Reviewed-on: https://chromium-review.googlesource.com/256626
Trybot-Ready: Bertrand Simonnet <bsimonnet@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
1 file changed