Tweak perfprofd sepolicy to include ipc_lock self capability.

Bug: http://b/19483574
Change-Id: Id39a5aaf531d2a75a22647bdafb34a6ef18201c8
(cherry picked from commit 728fe3d4)

perfprofd.te

@@ -47,4 +47,7 @@ userdebug_or_eng(`
   # simpleperf is going to execute "sleep"
   allow perfprofd toolbox_exec:file x_file_perms;
 
+  # needed for simpleperf on some kernels
+  allow perfprofd self:capability ipc_lock;
+
 ')