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The platform testing information in the readme currently states which
Linaro release has been tested on Juno platform.

This patch adds the same information for the AArch64/32 FVPs platforms.

Change-Id: Ifa89843ee1744e5030367197648b7a2f4c44cc24
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>