logd: liblog: logcat: switch to android_log_clockid() (2)

android_log_timestamp returns the property leading letter,
it is better to return a clockid_t with android_log_clockid()

Bug: 23668800
Change-Id: I38dee773bf3844177826b03a26b03215c79a5359
diff --git a/liblog/logd_write.c b/liblog/logd_write.c
index 83c6dc2..11c6d9c 100644
--- a/liblog/logd_write.c
+++ b/liblog/logd_write.c
@@ -212,11 +212,7 @@
      *  };
      */
 
-    if (android_log_timestamp() == 'm') {
-        clock_gettime(CLOCK_MONOTONIC, &ts);
-    } else {
-        clock_gettime(CLOCK_REALTIME, &ts);
-    }
+    clock_gettime(android_log_clockid(), &ts);
 
     pmsg_header.magic = LOGGER_MAGIC;
     pmsg_header.len = sizeof(pmsg_header) + sizeof(header);