system_wrappers: rename interface -> include

BUG=webrtc:5095
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1413333002 .

Cr-Commit-Position: refs/heads/master@{#10438}
diff --git a/webrtc/modules/audio_coding/main/acm2/nack.cc b/webrtc/modules/audio_coding/main/acm2/nack.cc
index 525b1ea..d509045 100644
--- a/webrtc/modules/audio_coding/main/acm2/nack.cc
+++ b/webrtc/modules/audio_coding/main/acm2/nack.cc
@@ -15,7 +15,7 @@
 #include <algorithm>  // For std::max.
 
 #include "webrtc/modules/interface/module_common_types.h"
-#include "webrtc/system_wrappers/interface/logging.h"
+#include "webrtc/system_wrappers/include/logging.h"
 
 namespace webrtc {