Create subdir for cc rules.

Test: mixed_libc.sh
Change-Id: I7f43f283f40ad6236dcedfccae175a007ea252d2
diff --git a/cc/library_headers.go b/cc/library_headers.go
index 064e2b8..5d38fba 100644
--- a/cc/library_headers.go
+++ b/cc/library_headers.go
@@ -136,7 +136,7 @@
 
 	props := bazel.BazelTargetModuleProperties{
 		Rule_class:        "cc_library_headers",
-		Bzl_load_location: "//build/bazel/rules:cc_library_headers.bzl",
+		Bzl_load_location: "//build/bazel/rules/cc:cc_library_headers.bzl",
 	}
 
 	ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: module.Name()}, attrs)