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Hotplug detection is periodic operation to detect new/removed device. In case of directly connected device fires hotplug devices but remote devices which are plugged in hdmi switch may not report their existence. Hotplug action polls all devices in regular base; 5s for system audio (only when it's active) 15s for others. Change-Id: I77c308ecfd5d6bf92f306923fa5ac9eabdad4127