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Collect OP-TEE OS revision from secure world for both SMC and FF-A ABIs, store it in the OP-TEE driver, and expose it through the generic get_tee_revision() callback. Signed-off-by: Aristo Chen <aristo.chen@canonical.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>