ci: remove spm el2 configs

Remove following test configuration which adds no coverage vs existing
spm test configs:

group/tf-l1-build-fvp/fvp-spm-el2:nil
tf_config/fvp-spm-el2

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I18e83b54c6ab6adbdb273f6eaedf9b46434eb877
2 files changed