Add platform specific TRNG driver

Adds platform specific TRNG driver to Crypto opteesp deployment.
Fetches and builds the TZ-TRNG driver from its external
repo and includes it when the crypto/opteesp is built for
the arm/fvp/fvp_base_revc-2xaemv8a platform.  Device region
information provided as external configuration data is
not yet integrated to the TRNG hardware is not yet used.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: I8a2946643a279dfcc3aff608427c85e674f0e084
32 files changed