debugd: Tie modem manager DBus proxy dependencies to cellular USE flags. BUG=chromium:360874 TEST=Tested the following: 1. `USE=cellular emerge-$BOARD platform2` 2. `USE=-cellular emerge-$BOARD platform2` 3. Verify information reported by debugd under chrome://system. Change-Id: I441749aa9bd6ea50080ed96f1dbbf1a0ab89a938 Reviewed-on: https://chromium-review.googlesource.com/193497 Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org> Reviewed-by: Mike Frysinger <vapier@chromium.org> Tested-by: Ben Chan <benchan@chromium.org> Commit-Queue: Ben Chan <benchan@chromium.org>
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