EBBR.yaml: triage new simple text input ex and hii failures

When running the new 32b ACS-IR, new Simple Text Input Ex and HII Database
failures are caught. Triage them automatically after analysis.

While at it, update one comment in the config file to better match the
reality and update the schema.

Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>