regulators: Implement ComparePresenceAction class

The ComparePresenceAction::execute() method reads the presence value
using the Services->getPresenceService()->isPresent() method.
T

regulators: Implement ComparePresenceAction class

The ComparePresenceAction::execute() method reads the presence value
using the Services->getPresenceService()->isPresent() method.
Then it compares the actual value to the expected value.
It returns true if they match and false if they don't.

Signed-off-by: Bob King <Bob_King@wistron.com>
Change-Id: Ie6a17191313b2c80a0ecd7a7d7357448985d0673

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