Add dependency to required provider for DHCP app

Change-Id: I35785bfebe68bea180c5d78d58067bc0eba046c9
diff --git a/apps/dhcp/BUILD b/apps/dhcp/BUILD
index dbf2ac4..911172d 100644
--- a/apps/dhcp/BUILD
+++ b/apps/dhcp/BUILD
@@ -6,6 +6,7 @@
 onos_app(
     category = "Utility",
     included_bundles = BUNDLES,
+    required_apps = ["org.onosproject.hostprovider"],
     title = "DHCP Server",
     url = "http://onosproject.org",
 )