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.cpp b/media/libaudiohal/2.0/DevicesFactoryHalLocal.cpp
index 13a9acd..6f60775 100644
--- a/media/libaudiohal/2.0/DevicesFactoryHalLocal.cpp
+++ b/media/libaudiohal/2.0/DevicesFactoryHalLocal.cpp
@@ -26,6 +26,7 @@
 #include "DevicesFactoryHalLocal.h"
 
 namespace android {
+namespace V2_0 {
 
 static status_t load_audio_interface(const char *if_name, audio_hw_device_t **dev)
 {
@@ -66,4 +67,5 @@
     return rc;
 }
 
+} // namespace V2_0
 } // namespace android