ci: remove legacy Gerrit handling from local CI

The `GERRIT_` variables used by the `clone_repos.sh` script used to be
passed by a Jenkins job when triggering the CI scripts from the legacy
CI. This is now dead code, as this script is used exclusively by the
local CI.

Change-Id: If1598f5015335209e73067e6e84db3769fdf6d21
Signed-off-by: Chris Kay <chris.kay@arm.com>
(cherry picked from commit e38de7ab7b6bac49fc0a2976610fecabc5b3b014)
1 file changed