tf-a-lts2.8-tftf-gerrit-tforg-l1,2: Explicitly set TF_GERRIT_BRANCH

Similar to tf-a-lts2.8-main.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I378a723a6e5047fb799b59c5442e108c6ed3dbab
2 files changed