mbedtls-amis: Checkout code from TF repo

Checkout code from TF repo[1]

[1]: https://git.trustedfirmware.org/next/ci/mbedtls-amis.git

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I754554aed36bc079af3f35dc061893becda3a9a9
1 file changed