Revert remainings of "ANDROID: security,perf: Allow further restriction of perf_event_open"

When reverting commit 5dbd8df7 ("ANDROID: security,perf: Allow
further restriction of perf_event_open") with commit e92b6ef8
("Revert "ANDROID: security,perf: Allow further restriction of
perf_event_open""), some lines were left out. Remove that dead code.

Fixes: e92b6ef8 ("Revert "ANDROID: security,perf: Allow further restriction of perf_event_open"")
Signed-off-by: Matthias Maennich <maennich@google.com>
Change-Id: Ia53795c909fdb6686176e6a1540f793e248f13a3