tf-a-lts2.8-tftf-gerrit-tforg-l1,2: Explicitly set SPM_REFSPEC to right branch

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I88991c3695edb16550ca4d5b8ee2f78a11a7bb6b
2 files changed