Remove the monotonic option for logging

This has been around for ~5 years but there has been roughly no
adoption, so remove this as we clean up the logging code.

Future efforts may track the monotonic timestamp in all cases.

Test: logging unit tests
Change-Id: I55ed565669f923988e741f6b384141bba893630d
diff --git a/liblog/logprint.cpp b/liblog/logprint.cpp
index 9e8d277..238431f 100644
--- a/liblog/logprint.cpp
+++ b/liblog/logprint.cpp
@@ -216,11 +216,7 @@
   p_ret->year_output = false;
   p_ret->zone_output = false;
   p_ret->epoch_output = false;
-#ifdef __ANDROID__
-  p_ret->monotonic_output = android_log_clockid() == CLOCK_MONOTONIC;
-#else
   p_ret->monotonic_output = false;
-#endif
   p_ret->uid_output = false;
   p_ret->descriptive_output = false;
   descriptive_output = false;
@@ -1465,13 +1461,10 @@
   nsec = entry->tv_nsec;
 #if __ANDROID__
   if (p_format->monotonic_output) {
-    /* prevent convertMonotonic from being called if logd is monotonic */
-    if (android_log_clockid() != CLOCK_MONOTONIC) {
-      struct timespec time;
-      convertMonotonic(&time, entry);
-      now = time.tv_sec;
-      nsec = time.tv_nsec;
-    }
+    struct timespec time;
+    convertMonotonic(&time, entry);
+    now = time.tv_sec;
+    nsec = time.tv_nsec;
   }
 #endif
   if (now < 0) {