tf-a-gerrit-tforg-l1/l2: Add explicit TFTF_* params

As we proceed to support multi-branch development (e.g. LTS branches),
have explicit repo/branch parameters for repositories used. This will
allow to use these jobs as templates for other branches, without confusion
of what parameters used where and without forgetting to update them as
needed.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ib80d63fa819a8e949b2e31ac9f1748c6a521bba3
2 files changed