Add IsMigratableToCSI to volume plugin interface

pkg/volume/git_repo/git_repo.go

@@ -78,6 +78,10 @@ func (plugin *gitRepoPlugin) CanSupport(spec *volume.Spec) bool {
 	return spec.Volume != nil && spec.Volume.GitRepo != nil
 }
 
+func (plugin *gitRepoPlugin) IsMigratedToCSI() bool {
+	return false
+}
+
 func (plugin *gitRepoPlugin) RequiresRemount() bool {
 	return false
 }