run_ctest.py: Remove FVP version checks

Remove faulty version check from run_ctest script. The initial releases
of the Corstone-300 FVP contained some bugs causing things to not run
properly, however those are now several years old and are most likely
not used anymore.

Change-Id: I5cdbb55cfe2dd832573058aafe2a10e2f95b88e7
Signed-off-by: Jonny Svärd <jonny.svaerd@arm.com>