Merge tag 'system-thread-for-v6.8' of https://git.linaro.org/people/jens.wiklander...

OP-TEE add reserved system thread

Add support for a reserved system thread in the SMC-ABI of the OP-TEE driver.
SCMI with OP-TEE transport uses this to guarantee that it will always have
a thread available in the secure world.

* tag 'system-thread-for-v6.8' of https://git.linaro.org/people/jens.wiklander/linux-tee:
  firmware: arm_scmi: optee: use optee system invocation
  tee: optee: support tracking system threads
  tee: system session
  tee: optee: system thread call property

Link: https://lore.kernel.org/r/20231211102600.GA571787@rayden
Signed-off-by: Arnd Bergmann <arnd@arndb.de>