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/DeviceHalLocal.h b/media/libaudiohal/2.0/DeviceHalLocal.h
index aec201a..11e063a 100644
--- a/media/libaudiohal/2.0/DeviceHalLocal.h
+++ b/media/libaudiohal/2.0/DeviceHalLocal.h
@@ -21,6 +21,7 @@
 #include <media/audiohal/DeviceHalInterface.h>
 
 namespace android {
+namespace V2_0 {
 
 class DeviceHalLocal : public DeviceHalInterface
 {
@@ -122,6 +123,7 @@
     uint32_t version() const { return mDev->common.version; }
 };
 
+} // namespace V2_0
 } // namespace android
 
 #endif // ANDROID_HARDWARE_DEVICE_HAL_LOCAL_H