bootstat: Add Tj thermal shutdown

Add "reboot,thermal,tj" to kBootReasonMap

Bug: 174705050
Test: adb shell echo 110000 > /dev/thermal/tz-by-name/BIG/emul_temp
adb shell bootstat -p

Change-Id: Iea7da4024a57eff7a758e0e9a2321eb220fc5c28
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index ee1ae31..d6ebb0d 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -438,6 +438,7 @@
     {"reboot,mount_userdata_failed", 190},
     {"reboot,forcedsilent", 191},
     {"reboot,forcednonsilent", 192},
+    {"reboot,thermal,tj", 193},
 };
 
 // Converts a string value representing the reason the system booted to an