audiopolicy: Remove ; after namespace bracket

Semicolons are not needed after the closing bracket of
a namespace, remove it.

Test: compiles
Change-Id: Ie82930365f738fd9c95a9163839a68b772e49d95
diff --git a/services/audiopolicy/engineconfigurable/interface/AudioPolicyPluginInterface.h b/services/audiopolicy/engineconfigurable/interface/AudioPolicyPluginInterface.h
index 759d0c9..2e29a9b 100644
--- a/services/audiopolicy/engineconfigurable/interface/AudioPolicyPluginInterface.h
+++ b/services/audiopolicy/engineconfigurable/interface/AudioPolicyPluginInterface.h
@@ -143,4 +143,4 @@
     virtual ~AudioPolicyPluginInterface() {}
 };
 
-}; // namespace android
+} // namespace android