refactor(fvp): change all occurrences of RSS to RSE

Changes all occurrences of "RSS" and "rss" in the code and build files
to "RSE" and "rse".

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: I36b8e498f3226fc72d21634aae2cc9328d00711d
2 files changed