Don't enable forced re-enrollment on non-chrome hardware.
Add a firmware type check as a signal to indicate that we're running
on non-chrome hardware. In that environment, it doesn't make sense to
enable forced re-enrollment as state key generation will likely fail
anyways. The --enterprise-enable-forced-re-enrollment=always flag
still allows one to manually switch FRE on in these environments if it
is actually desired.
BUG=chromium:426781
TEST=FRE not triggering in VMs.
Review URL: https://codereview.chromium.org/
788943002
Cr-Commit-Position: refs/heads/master@{#308562}