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The generic LOAD_IMAGE_V2 framework has been merged and enable for almost
all the arm platform. Because qemu platform doesn't share those common
files with arm, QEMU haven't got this support yet.

This patch add all the necessary code the files for adding LOAD_IMAGE_V2
support on QEMU and enable it as default.

Fixes ARM-software/tf-issues#507
Signed-off-by: Fu Wei <fu.wei@linaro.org>