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DEVICE2 is not currently used on qemu platform but is needed for
a future patch for qemu_sbsa platform. Change its definition to
RW and add it to all levels of arm-tf similar to DEVICE1 definition.
Signed-off-by: Graeme Gregory <graeme@nuviainc.com>
Change-Id: I03495471bfd423b61ad44ec4953fb25f76aa54bf