Add Mastership Load Balancer into TOST build profile

Change-Id: Ie697c435e9e6249978eb85137a317295af0dd3ca
(cherry picked from commit bb76f378070306a527ee21c89bc6b9489c34bcb8)
diff --git a/tools/build/bazel/modules.bzl b/tools/build/bazel/modules.bzl
index fa484a6..efabaf9 100644
--- a/tools/build/bazel/modules.bzl
+++ b/tools/build/bazel/modules.bzl
@@ -219,7 +219,7 @@
     "//apps/mcast:onos-apps-mcast-oar": ["seba", "tost"],
     "//apps/metrics:onos-apps-metrics-oar": [],
     "//apps/mfwd:onos-apps-mfwd-oar": [],
-    "//apps/mlb:onos-apps-mlb-oar": [],
+    "//apps/mlb:onos-apps-mlb-oar": ["tost"],
     "//apps/mobility:onos-apps-mobility-oar": [],
     "//apps/network-troubleshoot:onos-apps-network-troubleshoot-oar": [],
     "//apps/newoptical:onos-apps-newoptical-oar": [],