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During boot the platform enables dual execution for Xavier CPUs.
This patch reads back the ACTLR_ELx register to verify that the bit
is actually set. It asserts if the bit is not set.

Change-Id: I5ba9491ced86285d307b95efa647a427ff77c79e
Signed-off-by: Kalyani Chidambaram Vaidyanathan <kalyanic@nvidia.com>