Handle OP-TEE inter-TA invocation error path properly

[sangho2]

If the size of a buffer that a TA provides (for syscalls and PTA methods) is smaller than the required size, OP-TEE OS returns a ShortBuffer error along with the required size. However, currently, the OP-TEE shim doesn't return the required size.

[sangho2]

Inter-TA invocation does copy back on all non-TargetDead paths. We need to consider this as well when we support this feature.

[sangho2]

PR #1025 is merged, so the original ShortBuffer error issue is resolved. Since we don't support inter-TA invocation yet, let's keep this issue for a while.