Add missing cereal dependency

The repository uses cereal as a serialization library to persist
the dbus object changes.So we better add it to the dependency list
so that , there will be an explicit

Add missing cereal dependency

The repository uses cereal as a serialization library to persist
the dbus object changes.So we better add it to the dependency list
so that , there will be an explicit checking in the configuration
stage rather than bailing out with a compile failure.

Change-Id: Id674c3a1eb47d9df9a9aaeaba278509f467765b8
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>

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