optee: probe RPMB device using RPMB subsystem

Adds support in the OP-TEE drivers (both SMC and FF-A ABIs) to probe and
use an RPMB device via the RPMB subsystem instead of passing the RPMB
frames via tee-supplicant in user space. A fallback mechanism is kept to
route RPMB frames via tee-supplicant if the RPMB subsystem isn't
available.

The OP-TEE RPC ABI is extended to support iterating over all RPMB
devices until one is found with the expected RPMB key already
programmed.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Manuel Traut <manut@mecka.net>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lore.kernel.org/r/20240814153558.708365-5-jens.wiklander@linaro.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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