Move android::hidl to android::hardware.

Also moved Status and PersistableBundle out of their
respective 'binder' and 'os' namespaces.

Bug: 30507513
Change-Id: I8822070049a9c1b1b89753aaeb148b05b2aa851d
diff --git a/Binder.cpp b/Binder.cpp
index d0a09f8..1471c9c 100644
--- a/Binder.cpp
+++ b/Binder.cpp
@@ -25,7 +25,7 @@
 #include <stdio.h>
 
 namespace android {
-namespace hidl {
+namespace hardware {
 
 // ---------------------------------------------------------------------------
 
@@ -273,5 +273,5 @@
 
 // ---------------------------------------------------------------------------
 
-}; // namespace hidl
+}; // namespace hardware
 }; // namespace android