Align LibAudioHal V2 and V4 for factorisation

In order to merge the two version, they must first align as much
as possible.

Test: playback music, assistant
Change-Id: If517cc3f4646a224af3e9b3d42b68a75f1801b39
Signed-off-by: Kevin Rocard <krocard@google.com>
diff --git a/media/libaudiohal/2.0/DevicesFactoryHalLocal.h b/media/libaudiohal/2.0/DevicesFactoryHalLocal.h
index b9d18ab..41330b4 100644
--- a/media/libaudiohal/2.0/DevicesFactoryHalLocal.h
+++ b/media/libaudiohal/2.0/DevicesFactoryHalLocal.h
@@ -24,6 +24,7 @@
 #include "DeviceHalLocal.h"
 
 namespace android {
+namespace V2_0 {
 
 class DevicesFactoryHalLocal : public DevicesFactoryHalInterface
 {
@@ -41,6 +42,7 @@
     virtual ~DevicesFactoryHalLocal() {}
 };
 
+} // namespace V2_0
 } // namespace android
 
 #endif // ANDROID_HARDWARE_DEVICES_FACTORY_HAL_LOCAL_H