refactor(spm): fine tune sme test configs

Removed tf_config/fvp-spm-sme-only (duplication of
tf_config/fvp-spm-sve+sme2).
Renamed tf_config/fvp-spm-sve+sme2 to tf_config/fvp-spm-sve+sme and
related test configs.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I5d0efa8cd87099191fa7d9f1efb0422d70e6d5d3
5 files changed