tee_client_api: Correct max shared memory size define
tee_client_api: Correct max shared memory size define

Signed-off-by: Lukasz Kostyra <e09a3635cd662841b9efc7a2072bd3d229cd8ff8@samsung.com>
Reviewed-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org>
Reviewed-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>

prime-zeng/optee_client