Align source structure away from anti-patterns

The anti-patterns document comments on source structure, specifically on
placing internal headers in a parallel subtree[1]. entity-manager is an
exampl

Align source structure away from anti-patterns

The anti-patterns document comments on source structure, specifically on
placing internal headers in a parallel subtree[1]. entity-manager is an
example of violating this anti-pattern, so fix it.

[1]: https://github.com/openbmc/docs/blob/master/anti-patterns.md#placing-internal-headers-in-a-parallel-subtree

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I6c9739d1d532ea670e5ceb30044017c38e49eed3

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