bootstat: Log the ro.boot.bootreason property through the new platform_reason Tron field.

Bug: 63584589
Test: none
Change-Id: Ifd6f3d4432d764b5ffc7db10dec5e573214f7c97
diff --git a/libmetricslogger/Android.bp b/libmetricslogger/Android.bp
index c692d1f..9b179d1 100644
--- a/libmetricslogger/Android.bp
+++ b/libmetricslogger/Android.bp
@@ -19,10 +19,13 @@
         "-Wextra",
         "-Werror",
 
-        // 524291 corresponds to sysui_histogram, from
-        // frameworks/base/core/java/com/android/internal/logging/EventLogTags.logtags
-        "-DHISTOGRAM_LOG_TAG=524292",
+        // The following defines map logtag IDs as represented by:
+        //   frameworks/base/core/java/com/android/internal/logging/EventLogTags.logtags
+        //
+        // E.g., 524290 corresponds to sysui_count.
         "-DCOUNT_LOG_TAG=524290",
+        "-DHISTOGRAM_LOG_TAG=524292",
+        "-DMULTI_ACTION_LOG_TAG=524292",
     ],
 }