Cleanup Hidl*Support.* files.

* Move gBnConstructorMap to Static.cpp/h
* update obsolete comments

Test: compiles

Change-Id: If9720b8fc3b09e9b91b8fdc04bcde269208471ed
diff --git a/transport/Static.cpp b/transport/Static.cpp
index 3bd0285..ddda712 100644
--- a/transport/Static.cpp
+++ b/transport/Static.cpp
@@ -25,5 +25,7 @@
 Mutex gDefaultServiceManagerLock;
 sp<android::hidl::manager::V1_0::IServiceManager> gDefaultServiceManager;
 
+std::map<std::string, std::function<sp<IBinder>(void*)>> gBnConstructorMap{};
+
 }   // namespace hardware
 }   // namespace android