Draft: test-cases: Add LTP test case for syscalls testing

LTP project offers test for each Linux Kernel syscall.

This commits adds support to launch ltp syscalls test on Apertis test framework.

Since the job description is given in the kernelci repository, there is no run step. see https://github.com/kernelci/test-definitions/blob/staging.kernelci.org/automated/linux/ltp/ltp.yaml

Also dependent packages are installed manually in the template, it looks like there is some convenient macros to do the same things.

example test jobs is here https://lava.collabora.co.uk/scheduler/job/6153858 This work has been done as part of https://phabricator.apertis.org/T8760.