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Add the code that probes the ITS from the device tree,
and initialize it.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/1416839720-18400-11-git-send-email-marc.zyngier@arm.com

Signed-off-by: Jason Cooper <jason@lakedaemon.net>