Change the default CI repo to tf-a-ci-scripts

Since all reviews are now done on tf-a-ci-scripts
change the default CI repo that is cloned for jobs
to tf-a-ci-scripts.

Change-Id: I932ed8ef021b598995690cc171a7dfc13b00f5aa
Signed-off-by: Zelalem <zelalem.aweke@arm.com>
3 files changed