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With this CL, ArcVmClientAdapter copies two prop files in
/usr/share/arcvm to /run/arcvm/host_generated with or without
modifications (depending on whether the board is unibuild)
before asking vm_concierge to start ARCVM.

BUG=b:123309049
TEST=try, verify manually on coral, verify chrome can run
 cros_region_data command.

Change-Id: Ic04676f3fc07fea8bb5b4a61525206151cd6d5e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906471Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714332}