doc: SCP Firmware Threat Model

Merged Darryl Green requested to merge github/fork/jimqui01/doc into master

Created by: jimqui01

The patch publishes the current threat model for release 2.6 of the SCP firmware. This patch also modifies some of the tools scripts to exclude PDF files.

Change-Id: I52363325c103292585afead5a6d88c355cdb4be6 Signed-off-by: Jim Quigley

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