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Also, enable the flag for all channels except stable.

Bug: b:130798103
Test: android-sh -c getprop | grep ro.boot.arc_print_spooler
Change-Id: I4ca45c248737bbc0e5c90ed679bfe2b77ec9ed12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784006Reviewed-by: Elijah Taylor <elijahtaylor@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693860}