Add submodule repo parameters to release/nightly jobs

The submodules are always cloned from the repos specified in these
parameters since [Mbed-TLS/mbedtls-test#206][1].

[1]: https://github.com/Mbed-TLS/mbedtls-test/pull/206

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: I76ace064548fc409ec63902816663b358afc2f61
4 files changed