Use bigger flavor for lma deployments

It was found that environments with 16g ram are dying
very fast, so using flavor with 28g ram.

Related-Prod: PRODX-3456
Change-Id: I51c3c2c28fad7f4da35a2283c3ac6e01adfae188
diff --git a/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-lma3.yaml b/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-lma3.yaml
index 03067e7..b917c7d 100644
--- a/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-lma3.yaml
+++ b/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-lma3.yaml
@@ -39,7 +39,7 @@
   ntw_metadata: {"labels": {"tfconfig":"enabled","tfconfigdb":"enabled","tfcontrol":"enabled","tfanalytics":"enabled","tfanalyticsdb":"enabled","tfwebui":"enabled","local-volume-provisioner": "enabled"}}
   # hardware_metadata which is used for Ceph requires flavor with
   # ephemeral storage because it is used for Ceph bluestore.
-  workers_flavor: 'system.compact.openstack.control.ephemeral'
+  workers_flavor: 'mosk.l.control.ephemeral'
   cmps_flavor: 'mosk.s.compute.ephemeral'
   storage_frontend_network_cidr: '10.12.1.0/24'
   storage_backend_network_cidr: '10.12.0.0/24'