remove submodule no longer needed

Signed-off-by: Rahul Sharma <rahulsharm@nvidia.com>

Author: rahulait

.gitmodules

@@ -2,7 +2,3 @@
 	path = aws-kube-ci
 	url = https://gitlab.com/nvidia/container-infrastructure/aws-kube-ci.git
 	branch = main
-[submodule "cnt-ci"]
-	path = cnt-ci
-	url = ../../../nsv-devops/cnt-ci.git
-	branch = main