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

Bug: 63584589
Test: none
Change-Id: Ifd6f3d4432d764b5ffc7db10dec5e573214f7c97
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index a0a9307..3b8b707 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -714,6 +714,9 @@
 // property.
 void RecordBootReason() {
   const std::string reason(GetProperty(bootloader_reboot_reason_property));
+  android::metricslogger::LogMultiAction(android::metricslogger::ACTION_BOOT,
+                                         android::metricslogger::FIELD_PLATFORM_REASON,
+                                         reason);
 
   // Log the raw bootloader_boot_reason property value.
   int32_t boot_reason = BootReasonStrToEnum(reason);