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The Neoverse reference design FVPs are now available for download from
the Arm FVP ecosystem page. Update the section on platform FVP download
with this information for all the supported platforms.
Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: I3f7e7d7dc0a20684140d5be61a531700fba56120

Add the initial user guide for the SGI-575 platform software stack. The
user guide points to documents that provide information about obtaining
the platform software stack and using the various features it supports.
A table to list the release tags is included as well.
Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: I4730ee89ece766577708126cec3cf0bc9e878bc3