Allow dumpstate to dump /proc/bootconfig

Test: adb shell dumpstate
Bug: 274528501
Change-Id: I0a4663a742e82d571811cb3fa9c15b8baaeeb847
diff --git a/public/dumpstate.te b/public/dumpstate.te
index 2c9f52f..58d6efa 100644
--- a/public/dumpstate.te
+++ b/public/dumpstate.te
@@ -221,6 +221,7 @@
 
 # Read files in /proc
 allow dumpstate {
+  proc_bootconfig
   proc_buddyinfo
   proc_cmdline
   proc_meminfo