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This CL enables also_build_ash_chrome gn arg on linux-lacros-rel to
support building both lacros chrome and ash-chrome inside the same
checkout.

Bug: 1129223
Change-Id: Ic549cd1c00ca2830314b4e8fd8e7fb700dc59b25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487696Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819130}