tf-a-lts2.8-tftf-gerrit-tforg-l*: Set TF_GERRIT_REFSPEC to lts-v2.8 branch

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I9562e0c9c8e758dcb20de3977b178440a958add6
2 files changed