logd: optimize statistics

- Go back to basic requirements
- Simplify
- use hash tables to minimize memory impact

Bug: 19608965
Change-Id: If7becb34354d6415e5c387ecea7d4109a15259c8
diff --git a/logd/LogBufferElement.h b/logd/LogBufferElement.h
index 25f1450..0628d3e 100644
--- a/logd/LogBufferElement.h
+++ b/logd/LogBufferElement.h
@@ -17,8 +17,9 @@
 #ifndef _LOGD_LOG_BUFFER_ELEMENT_H__
 #define _LOGD_LOG_BUFFER_ELEMENT_H__
 
-#include <sys/types.h>
 #include <stdatomic.h>
+#include <sys/types.h>
+
 #include <sysutils/SocketClient.h>
 #include <log/log.h>
 #include <log/log_read.h>