logd: wait for timeout via CLOCK_MONOTONIC

There are well known issues with CLOCK_REALTIME jumping drastically.

Test: --wrap works successfully
Change-Id: I5676274783ac9aa9374d2b9254e0109d883cc5a8
diff --git a/logd/LogTimes.h b/logd/LogTimes.h
index 9f6f203..49b2d9d 100644
--- a/logd/LogTimes.h
+++ b/logd/LogTimes.h
@@ -56,9 +56,8 @@
 
     SocketClient* mClient;
     log_time mStart;
-    struct timespec mTimeout;
+    struct timespec mTimeout;  // CLOCK_MONOTONIC based timeout used for log wrapping.
     const bool mNonBlock;
-    const log_time mEnd;  // only relevant if mNonBlock
 
     // Protect List manipulations
     static void wrlock(void) {