GN Templates: Move common_config to the template.

webrtc/common_audio/BUILD.gn

Index: webrtc/common_audio/BUILD.gn
diff --git a/webrtc/common_audio/BUILD.gn b/webrtc/common_audio/BUILD.gn
index 35f715a018e476e812a6cbb0aa3e4d0950f592c8..195e9718c7d07a773f8868795720f95911d6cde8 100644
--- a/webrtc/common_audio/BUILD.gn
+++ b/webrtc/common_audio/BUILD.gn
@@ -172,8 +172,6 @@ rtc_source_set("common_audio") {
     cflags = [ "/wd4334" ]  # Ignore warning on shift operator promotion.
   }
 
-  configs += [ "..:common_config" ]
-
   public_configs = [
     "..:common_inherited_config",
     ":common_audio_config",
@@ -238,7 +236,6 @@ if (rtc_build_with_neon) {
       ]
     }
 
-    configs += [ "..:common_config" ]
     public_configs = [ "..:common_inherited_config" ]
 
     if (is_clang) {
@@ -287,7 +284,6 @@ if (rtc_include_tests) {
       sources += [ "resampler/sinc_resampler_unittest.cc" ]
     }
 
-    configs += [ "..:common_config" ]
     public_configs = [ "..:common_inherited_config" ]
 
     if (rtc_use_openmax_dl) {