Move policy subdirectory into package directory

Go's tooling expects that all files in the same package are in the
same directory.  Move the policy/*.go files to policy_*.go.

Test: go test ./...
Change-Id: I7e81936ddd20a5ffb4770ae23bdb6e411d6924cc

tools/compliance/Android.bp

@@ -81,14 +81,14 @@ bootstrap_go_package {
         "doc.go",
         "graph.go",
         "noticeindex.go",
-        "policy/policy.go",
-        "policy/resolve.go",
-        "policy/resolvenotices.go",
-        "policy/resolveshare.go",
-        "policy/resolveprivacy.go",
-        "policy/shareprivacyconflicts.go",
-        "policy/shipped.go",
-        "policy/walk.go",
+        "policy_policy.go",
+        "policy_resolve.go",
+        "policy_resolvenotices.go",
+        "policy_resolveshare.go",
+        "policy_resolveprivacy.go",
+        "policy_shareprivacyconflicts.go",
+        "policy_shipped.go",
+        "policy_walk.go",
         "readgraph.go",
         "resolution.go",
         "resolutionset.go",
@@ -97,14 +97,14 @@ bootstrap_go_package {
         "condition_test.go",
         "conditionset_test.go",
         "readgraph_test.go",
-        "policy/policy_test.go",
-        "policy/resolve_test.go",
-        "policy/resolvenotices_test.go",
-        "policy/resolveshare_test.go",
-        "policy/resolveprivacy_test.go",
-        "policy/shareprivacyconflicts_test.go",
-        "policy/shipped_test.go",
-        "policy/walk_test.go",
+        "policy_policy_test.go",
+        "policy_resolve_test.go",
+        "policy_resolvenotices_test.go",
+        "policy_resolveshare_test.go",
+        "policy_resolveprivacy_test.go",
+        "policy_shareprivacyconflicts_test.go",
+        "policy_shipped_test.go",
+        "policy_walk_test.go",
         "resolutionset_test.go",
         "test_util.go",
     ],