all pipeline: Use ci-scripts fetch refspec which includes refs/changes/*

Consistently use extended fetch pattern, to be able to directly test
tf-m-ci-scripts patches submitted to Gerrit.

Addresses https://linaro.atlassian.net/browse/TFC-639

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I64be38d6dcd122ee7a508d7d15c73395d5949d9b
16 files changed