feat(arm): add boot test of new ARM_ROTPK_LOCATION

Add tf_config and boot test for new variant of ARM_ROTPK_LOCATION,
devel_full_dev_rsa_key, which implements the scenario where the
platform provides the full ROTPK, as opposed to the hash of it.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I8f1afa1f6410a8092a8c64179b4328d010e1adad
2 files changed