generate_report.sh: condition merge of code coverage report into main report

Open CI does not (yet) support the merge of code coverage report into main
report, so for the moment condition this task under the Jenkins Arm
environment.

Supporting this feature requires at least one new repo to be present
on gerrit, i.e [1], required by [2].

[1] https://review.trustedfirmware.org/tests/lava/test-definitions.git
[2] https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git/tree/script/test_definitions.sh

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: Ic49b1d33dd85d250af895b30dc1eb25d0b54c2d6
1 file changed