Adds AMD-TEE driver.
* targets AMD APUs which has AMD Secure Processor with software-based
  Trusted Execution Environment (TEE) support
* registers with TEE subsystem
* defines tee_driver_ops function callbacks
* kernel allocated memory is used as shared memory between normal
  world and secure world.
* acts as REE (Rich Execution Environment) communication agent, which
  uses the services of AMD Secure Processor driver to submit commands
  for processing in TEE environment

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: NJens Wiklander <jens.wiklander@linaro.org>
Co-developed-by: NDevaraj Rangasamy <Devaraj.Rangasamy@amd.com>
Signed-off-by: NDevaraj Rangasamy <Devaraj.Rangasamy@amd.com>
Signed-off-by: NRijo Thomas <Rijo-john.Thomas@amd.com>
Reviewed-by: NGary R Hook <gary.hook@amd.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>