tpm/tpm_ftpm_tee: A driver for firmware TPM running inside TEE

Add a driver for a firmware TPM running inside TEE.

Documentation of the firmware TPM:
https://www.microsoft.com/en-us/research/publication/ftpm-software-implementation-tpm-chip/ .

Implementation of the firmware TPM:
https://github.com/Microsoft/ms-tpm-20-ref/tree/master/Samples/ARM32-FirmwareTPM

Tested-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Tested-by: Thirupathaiah Annapureddy <thiruan@microsoft.com>
Signed-off-by: Thirupathaiah Annapureddy <thiruan@microsoft.com>
Co-authored-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>