Rework TOSA verification API

Change verifier API to consume verification configuration in a JSON
format and enable appropriate validation to be performed within the
verifier code in the reference model.
Also update to latest spec changes for main compliance but not yet
including bias support.

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: I0ceaa1714dd041b00b5b29cd937c8f05e701bc4c