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This change ports the software based SE context save routines.
The software implements the context save sequence for SE/SE2 and
PKA1. The context save routine is intended to be invoked from
the ATF SC7 entry.

Change-Id: I9aa156d6e7e22a394bb10cb0c3b05fc303f08807
Signed-off-by: Marvin Hsu <marvinh@nvidia.com>