remove dependency on implementation from policy preferred and strict

pkg/kubelet/cm/topologymanager/BUILD

-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
     srcs = [
         "policy.go",
+        "policy_preferred.go",
+        "policy_strict.go",
         "topology_manager.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/kubelet/cm/topologymanager",
@@ -31,3 +33,12 @@ filegroup(
     tags = ["automanaged"],
     visibility = ["//visibility:public"],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "policy_preferred_test.go",
+        "policy_strict_test.go",
+    ],
+    embed = [":go_default_library"],
+)

pkg/kubelet/cm/topologymanager/policy_preferred.go

@@ -25,7 +25,7 @@ type preferredPolicy struct{}
 var _ Policy = &preferredPolicy{}
 
 // PolicyPreferred policy name.
-const PolicyPreferred policyName = "preferred"
+const PolicyPreferred string = "preferred"
 
 // NewPreferredPolicy returns preferred policy.
 func NewPreferredPolicy() Policy {

pkg/kubelet/cm/topologymanager/policy_strict.go

@@ -25,7 +25,7 @@ type strictPolicy struct{}
 var _ Policy = &strictPolicy{}
 
 // PolicyStrict policy name.
-const PolicyStrict policyName = "strict"
+const PolicyStrict string = "strict"
 
 // NewStrictPolicy returns strict policy.
 func NewStrictPolicy() Policy {