common: add entity manager interface

Define an EntityManager interface to fetch the serial port related
config or any device config from Entity Manager.

Change-Id: Ieeff4422903e3b4bcc3ce28cd493eeca

common: add entity manager interface

Define an EntityManager interface to fetch the serial port related
config or any device config from Entity Manager.

Change-Id: Ieeff4422903e3b4bcc3ce28cd493eecab5618f13
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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