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This works even on SoCs that do not have an ARISC, and it avoids
clobbering whatever ARISC firmware might be running.

Change-Id: I9f2fed597189bb387de79e8e76a7da3375e1ee91
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>