Add sepolicy for simpleperf_boot.

simpleperf_boot is the secontext used to run simpleperf from init,
to generate boot-time profiles.

Bug: 214731005
Test: run simpleperf manually
Change-Id: I6f37515681f4963faf84cb1059a8d5845c2fe5a5
diff --git a/private/property.te b/private/property.te
index f63beb9..c9c811a 100644
--- a/private/property.te
+++ b/private/property.te
@@ -557,6 +557,7 @@
   domain
   -init
   userdebug_or_eng(`-profcollectd')
+  userdebug_or_eng(`-simpleperf_boot')
   userdebug_or_eng(`-traced_probes')
   userdebug_or_eng(`-traced_perf')
 } {