TBB: rework cert_create tool to follow a data driven approach

This patch reworks the certificate generation tool to follow a data
driven approach. The user may specify at build time the certificates

TBB: rework cert_create tool to follow a data driven approach

This patch reworks the certificate generation tool to follow a data
driven approach. The user may specify at build time the certificates,
keys and extensions defined in the CoT, register them using the
appropiate macros and the tool will take care of creating the
certificates corresponding to the CoT specified.

Change-Id: I29950b39343c3e1b71718fce0e77dcf2a9a0be2f

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Merge pull request #249 from danh-arm/jc/tbb_prototype

Trusted Board Boot Prototype

TBB: add tool to generate certificates

This patch adds a tool that generates all the necessary elements
to establish the chain of trust (CoT) between the images.

The tool reads the binary images an

TBB: add tool to generate certificates

This patch adds a tool that generates all the necessary elements
to establish the chain of trust (CoT) between the images.

The tool reads the binary images and signing keys and outputs the
corresponding certificates that will be used by the target at run
time to verify the authenticity of the images.

Note: the platform port must provide the file platform_oid.h. This
file will define the OIDs of the x509 extensions that will be added
to the certificates in order to establish the CoT.

Change-Id: I2734d6808b964a2107ab3a4805110698066a04be

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