Revert "DeviceSettings: remove dynamic fsync"

This reverts commit 5e83e8cbbced0160aa99aa3c065bbce0bfeb40f3.

Conflicts:

	DeviceSettings/res/values-ar/strings.xml
	DeviceSettings/res/values-bg/strings.xml
	DeviceSettings/res/values-de/strings.xml
	DeviceSettings/res/values-hr/strings.xml
	DeviceSettings/res/values-id/strings.xml
	DeviceSettings/res/values-lt/strings.xml
	DeviceSettings/res/values-ru/strings.xml
	DeviceSettings/res/values-sv/strings.xml

Change-Id: I9d5f9042b7c9a57208562fcaedb6e61257916745