Expanding TA Secure Memory on QEMUv8

Since some Rust examples such as tls_server-rs and tls_client-rs require larger TA memory (about 18M heap), we've expanded TA secure memory on OP-TEE QEMUv8 platform. On QEMUv8 platform it supports 7M TA memory originally, after expanding it supports 27M TA memory at most.

We modified the firmware and configuration of QEMU, ATF and OPTEE. You can download the pre-built image from https://nightlies.apache.org/teaclave/teaclave-trustzone-sdk/ or patch the code and build the images by yourself.

For details on the modifications, please refer to the Patches

Finally, build images:

$ cd optee-repo/build
$ make