Fix up configs applying to GN build.

The audio_processing target didn't have the build configs applying to it which led to some logging errors.

TBR=kjellander

Review URL: https://webrtc-codereview.appspot.com/22339004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7125 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/BUILD.gn b/webrtc/modules/audio_processing/BUILD.gn
index 950dfff..9bf4da0 100644
--- a/webrtc/modules/audio_processing/BUILD.gn
+++ b/webrtc/modules/audio_processing/BUILD.gn
@@ -78,6 +78,9 @@
     "voice_detection_impl.h",
   ]
 
+  configs += [ "../..:common_config" ]
+  direct_dependent_configs = [ "../..:common_inherited_config" ]
+
   defines = []
   deps = []