system_power: Add API definition guard
Created by: ronald-cron-arm
Change-Id: I8060024e45a187afacdc70f9f39c9083f4cce71c Signed-off-by: Ronald Cron ronald.cron@arm.com
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Created by: ronald-cron-arm
Change-Id: I8060024e45a187afacdc70f9f39c9083f4cce71c Signed-off-by: Ronald Cron ronald.cron@arm.com