arc: Disable ureadahead for ARCVM on request.
This handles explicit request to disable ureadahead in ARCVM for tests.
BUG=b:196390269
TEST=Locally in context of extended tast tests.
components_unittests --gtest_filter=*Ureadahead*
Change-Id: Iee25d2febe234c444d86403346cb7a5d3167b6c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3095534
Reviewed-by: Alan Ding <alanding@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#912756}
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