Enable incidentd access to ro.boot.bootreason

incident report contains similar data as in a bugreport, but in proto
format.

Test: adb shell incident -p LOCAL 1000
Bug: 152173578
Change-Id: Iee53a3b8a6c95629a1d5c15b4d17f3d680b14178
diff --git a/private/bootstat.te b/private/bootstat.te
index da3179b..016292e 100644
--- a/private/bootstat.te
+++ b/private/bootstat.te
@@ -15,6 +15,7 @@
   -bootanim
   -bootstat
   -dumpstate
+  userdebug_or_eng(`-incidentd')
   -init
   -recovery
   -shell