Tools: update iat-verifier README and samples

Update the README for iat-verifier to describe the compile_token and
decompile_token scripts, and update the samples to include a YAML token
description that can be used with compile_token.

Change-Id: Ibf8a88c6ca57fa5a76d05f552ad657db665d7cf5
Signed-off-by: Sergei Trofimov <sergei.trofimov@arm.com>
10 files changed