gen_test_desc: support specifying RMM configuration

Extend the test description to allow specifying RMM configuration.
All RMM test configurations are grouped under the rmm-* category.
The expected format for specifying RMM test configurations is as follows:
rmm_config, tf_config, tftf_config, spm_config, scp_config, scp_tools.

Change-Id: I5cbb1ecba1e33a82e88432cbd0ac01e4660663d2
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
1 file changed