sepolicy: perfd: fix signull permission

Commit 1a20a7fbc2 ("sepolicy: perf: allow checking for existence of
other processes (signull)") was implemented incorrectly. It granted
perfd only permissions to signull itself, not other processes. Fix
this, granting signull permissions to all processes by using the
'domain' attribute.

Change-Id: I5ea7c543ba5854550bb020382b43368d75244f32
1 file changed