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
1 file changed