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ISB instruction was removed from the N1 1043202 Errata Workaround [1], this
fix is adding the ISB instruction back in.

[1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.pjdoc-466751330-10325/index.html

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I74eac7f6ad38991c36d423ad6aa44558033ad388