[dlc-predownload-list] Set the supported_on tag for the DeviceDlcPredownloadPolicy

DLC containing the Ricoh scanning driver will land in M125, thus setting
the supported_on tag for the corresponding policy.

Launch: https://launch.corp.google.com/launch/4307190

Bug: b/290337675
Change-Id: I727ebeab90727dee492541445ada7335bd43f25c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5424972
Auto-Submit: Andrei Nedoluzhko <nedol@google.com>
Commit-Queue: Andrei Nedoluzhko <nedol@google.com>
Reviewed-by: Victor Gabriel Savu <vsavu@google.com>
Reviewed-by: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/main@{#1285136}