Add sepolicy for simpleperf_app_runner.

Bug: 118835348
Test: build and boot pixel 3.
Test: run simpleperf_app_runner manually.

Change-Id: Ifb6c2ab78e075684bc197d06f761becced8281d1
diff --git a/private/file_contexts b/private/file_contexts
index 474c637..01c5bb0 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -314,6 +314,7 @@
 /system/bin/watchdogd            u:object_r:watchdogd_exec:s0
 /system/bin/apexd                u:object_r:apexd_exec:s0
 /system/bin/gsid                 u:object_r:gsid_exec:s0
+/system/bin/simpleperf_app_runner    u:object_r:simpleperf_app_runner_exec:s0
 
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 # Vendor files