synquacer: Enable optional OP-TEE support

OP-TEE loading is optional on Developerbox controlled via SCP
firmware. To check if OP-TEE is loaded or not, we use DRAM1 region
info passed by SCP firmware.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>