Allow dumpstate to access /proc/cgroups

It contains useful information for bug reports.

Bug: 406851260
Test: adb bugreport br.zip # Check inside for /proc/cgroups contents
Flag: NONE Fails gracefully even if file doesn't exist / can't be accessed
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:940944a34a1f7079b4def62425094b5b6161d871)
Merged-In: I1b846b54f8885fa88a6dfccf112c5ffbec65451e
Change-Id: I1b846b54f8885fa88a6dfccf112c5ffbec65451e
diff --git a/private/dumpstate.te b/private/dumpstate.te
index b92ca6f..eb13fc8 100644
--- a/private/dumpstate.te
+++ b/private/dumpstate.te
@@ -402,6 +402,7 @@
   proc_bootconfig
   proc_buddyinfo
   proc_cmdline
+  proc_cgroups
   proc_meminfo
   proc_modules
   proc_net_type