Add script for setting up QEMU and OP-TEE

The script will clone and download all needed gits to run OP-TEE
using a QEMU with TrustZone patches.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (Ubuntu 14.01 64-bit)
Tested-by: Jens Wiklander <jens.wiklander@linaro.org> (Linux Mint 17 64-bit)