ci: sync hafnium to internal gerrit

Added necessary support in the scripts to sync hafnium main tree to
internal gerrit.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I7ab7483263d232ace51a25e4969ff7c6c34b274f
diff --git a/arm-env.sh b/arm-env.sh
index 93a9016..421f0c8 100644
--- a/arm-env.sh
+++ b/arm-env.sh
@@ -24,6 +24,7 @@
 cc_src_repo_tag="${cc_src_repo_tag:-kernel-team-workflow_2019-09-20}"
 scp_tools_src_repo_url="${scp_tools_src_repo_url:-https://$arm_gerrit_url/scp/tools-non-public}"
 tf_for_scp_tools_src_repo_url="https://$arm_gerrit_url/scp/test-framework"
+spm_arm_gerrit_repo="ssh://$arm_gerrit_url:29418/trusted-firmware/spm.git"
 
 # Arm Coverity server.
 export coverity_host="${coverity_host:-coverity.cambridge.arm.com}"