Create subdir for cc rules.

Test: mixed_libc.sh
Change-Id: I7f43f283f40ad6236dcedfccae175a007ea252d2
diff --git a/cc/proto.go b/cc/proto.go
index f3410bc..3cf1453 100644
--- a/cc/proto.go
+++ b/cc/proto.go
@@ -210,7 +210,7 @@
 	ctx.CreateBazelTargetModule(
 		bazel.BazelTargetModuleProperties{
 			Rule_class:        rule_class,
-			Bzl_load_location: "//build/bazel/rules:cc_proto.bzl",
+			Bzl_load_location: "//build/bazel/rules/cc:cc_proto.bzl",
 		},
 		android.CommonAttributes{Name: name},
 		&protoAttrs)