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The Arm GIC-Clayton IP has the same power management requirements as
the GIC-600, when it comes to powering up the redistributors before
using them.

Add the IIDR value to the existing list of implementations requiring
the power sequence.

Change-Id: Ib965dfe278c40a4fff94f65a8d445c27a2ae6fd2
Signed-off-by: Andre Przywara <andre.przywara@arm.com>