refactor(fvp): add comment to RME run config

Add implication of RME options to following run configs:
fvp-tftf.rme
fvp-spm-tftf.rme.bmcov

Explain the effect of bp.secure_memory=0 and bp.has_rme=1

Align the ordering of options in the latter config to the
former for cosmetics.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Ia43af1456fd9a38e790c6be069beaadc2dd70f43
2 files changed