side-switch: adapt do chassis state instance change

phosphor-state-manager moved to a multi chassis and multi host design
point. This made their corresponding service files instance based. For
backwards support, instance 0 will always represent the entire system,
so utilize that as the dependency in this service file.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I6a32ff5944b803cdeaa4ba9fd5faa0e3d49263fe
1 file changed