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Create GN flags to ensure target code compiles only on the cfm platform

Create Feature flags to support experiments specifically for
enabled chromium support for mojo based services on the platform layer
of cfm provisioned devices.

Adds support for hotline dbus and mojom

BUG=chromium:1105567
TEST='Set feature and gn flag to true/false ran respective dbus/services
tests'

Change-Id: Ica004eddd2f59398dcacc4e0d35d1b536705fa2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298486
Commit-Queue: Kyle Williams <kdgwill@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791155}