refactor: rename existing RAS related tests

So far in TF-A, RAS meant Firmware first handling of RAS errors. With
new changes we have two ways to handle RAS errors, Firmware First and
Kernel First.To distinguish between them following changes are done
  1. Existing RAS tests are renamed as RAS_FFH
  2. The run config for RAS(fvp-aemv8a.fi) applies patches and also
     generates the run config. For the KFH support we do not need any
     patch application. Move patch application part to new run config

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I89365cb96a10c04de0ccc5bc477b52a29f9e6200
5 files changed