feat(neoverse_rd): deprecate and remove RD-N1-Edge platform variants

deprecate and remove support for RD-N1-Edge and RD-N1-Edgex2 platform
variants.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I59dce73b70014b3416d89b0d024d7204356b1b77
15 files changed