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The new file, /run/arcvm/host_generated/fstab, is exported by crosvm
to the guest via the device tree so the guest can read certain files
in its init's first stage.

Previously, the generated file was just:

/run/arcvm/host_generated/factory/factory.prop

With this CL, they will be:

/run/arcvm/host_generated/fstab
/run/arcvm/host_generated/combined.prop

This CL depends on
https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2217082

BUG=b:157188856
TEST=arc.BuildProperties.vm

Change-Id: Ia646fe592e94e83ddce80e21177086f5b996ee3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216916Reviewed-by: Long Cheng <lgcheng@google.com>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773532}