Disable minijail for unibuild

Mosys is installed for test images only, except for the three
remaining pre-unibuilds (Asuka, Caroline, Chell).

We can disable the minijail library for unibuilds, as we don't care
about sandboxing the behavior if it's in a test image only.

While I'm here, I can delete the ARM-only minijail setup quirk, as
there's no ARM pre-unibuilds that remain.

BUG=b:277796574
TEST=CQ

Change-Id: Ifb708c062095cc0d18f05ef2c2c7ea6751d84496
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/4443488
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
2 files changed