feat(fvp): remove left-over RSS usage

Remove any residual RSS usage in the FVP platform, complementing the
changes made in commit dea307fd6cca2dad56867e757804224a8654bc38.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I9ced272503456361610ec0c7783d270349233926
3 files changed