The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/ee72e6f436c93a27c717c6e1f709ddd66aafd004

commit ee72e6f436c93a27c717c6e1f709ddd66aafd004
Author: Manoj Gupta <manojgupta@google.com>
Date: Tue Oct 24 12:42:01 2017

Stop building MIPS toolchain.

MIPS is not used so disable it from toolchain.conf. This will
stop SDK builder from building it as well.

BUG= chromium:777687 
TEST=MIPS toolchain not built.
TEST=https://uberchromegw.corp.google.com/i/chromiumos.tryserver/builders/chromiumos-sdk/builds/2641

Change-Id: I01ebf2f85bce94f094073d822e60bc30f36087ea
Reviewed-on: https://chromium-review.googlesource.com/734721
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/ee72e6f436c93a27c717c6e1f709ddd66aafd004/overlay-mipsel-o32-generic/toolchain.conf